This excerpt taken from the VRSN 8-K filed Jan 4, 2007.
If you intend to accept the Options Election with respect to an option, you must accept the Options Election with respect to all of the shares subject to the option grant. You may not pick and choose which of the shares subject to an option grant with which you choose to accept this Options Election. If you have exercised a portion of an eligible option grant, your election will apply to the portion that remains outstanding and unexercised. If
an eligible option grant is subject to a domestic relations order (or comparable legal document as the result of the end of a marriage), you may only accept the Options Election with respect to the portion you beneficially own; such election must be with respect to all shares beneficially owned by you.