The Optionee shall, not later than the date as of which the exercise of the Stock Option becomes a taxable event for federal income tax purposes, pay to the Company or make arrangements satisfactory to the Board for payment of any federal, state, and local taxes required by law to be withheld on account of such taxable event. The minimum required tax withholding obligation may be satisfied, in whole or in part, by the Company withholding from the Option Shares to be issued a number of Shares with an aggregate Fair Market Value that would satisfy the withholding amount due.