EXHIBIT 4.2 INCENTIVE STOCK OPTION AGREEMENT

This Option is intended to be an incentive stock option under section 422 of the Internal Revenue Code and will be interpreted accordingly.

No Shares will vest until you have performed _________ (____) months of Service from the commencement of your employment with the Company. Your Option shall vest as to ________ of the Shares on the date _______ (____) months from the Vesting Start Date as shown on the cover sheet. Thereafter, Shares shall vest at the rate of _______ of the Shares at the end of each full month thereafter. After you have completed _________ (____) months of Service, the number of Shares which vest under this Option at the Exercise Price shall be equal to the product of the number of full months of your continuous employment with the Company (“Service”) (including any approved leaves of absence) from the Vesting Start Date times the number of Shares covered by this Option times ________. The resulting number of Shares will be rounded to the nearest whole number. No additional Shares will vest after your Service has terminated for any reason.

You should note that you may exercise the Option prior to vesting. In that case, the Company has a right to repurchase the unvested shares at the original exercise price if you terminate employment before vesting in all shares you purchased. Also, if you exercise before vesting, you should consider making an 83(b) election. Please see the attached Tax Summary. The 83(b) election must be filed within 30 days of the date you exercise.

Your Option will expire in any event at the close of business at Company headquarters on the day before the tenth anniversary of the Date of Grant, as shown on the cover sheet. (It will expire earlier if your Service terminates, as described below.)

If your Service terminates for any reason except death, Disability or for “Cause,” your Option will expire at the close of business at Company headquarters on the 30th day after your termination date. During that 30-day period, you may exercise that portion of your Option that was vested on your termination date.

If you die while in Service with the Company, your Option will expire at the close of business at Company headquarters on the date six months after the date of death. During that six-month period, your estate or heirs may exercise that portion of your Option that was vested on the date of death.

If your Service terminates because of your Disability, your Option will expire at the close of business at Company headquarters on the date six months after your termination date. (However, if your Disability is not expected to result in death or to last for a continuous period of at least 12 months, your Option will be eligible for ISO tax treatment only if it is exercised within three months following the termination of your Service.) During that six-month period, you may exercise that portion of your Option that was vested on the date of your Disability.

“Disability” means that you are unable to engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment.

For purposes of this Option, your Service does not terminate when you go on a bona fide leave of absence that was approved by the Company in writing, if the terms of the leave provide for continued service crediting, or when continued service crediting is required by applicable law. However, your Service will be treated as terminating 30 days after you went on leave, unless your right to return to active work is guaranteed by law or by a contract. Your Service terminates in any event when the approved leave ends unless you immediately return to active work. The Company determines which leaves count for this purpose, and when your Service terminates for all purposes under the Plan. The Company also determines the extent to which you may exercise the vested portion of your Option during a leave of absence.

When you wish to exercise this Option, you must execute Exhibit A (and, if exercise is prior to vesting, you must also execute Exhibits B and D). Your exercise will be effective when it is received by the Company. If someone else wants to exercise this Option after your death, that person must prove to the Company’s satisfaction that he or she is entitled to do so.