If an ISO optionee ceases to be employed by the Company and all Related Corporations by reason of such optionee's death, any ISO of such optionee may be exercised, to the extent of the number of shares with respect to which the optionee could have exercised on the date of the optionee's death, by the optionee's estate, personal representative or beneficiary who has acquired the ISO by will or by the laws of descent and distribution, at any time prior to the earlier of the specified expiration date of the ISO or one year from the date of the optionee's death.