Options shall be exercisable over the exercise period (which shall not exceed ten years from the date of grant), at such times and upon such conditions as the Board may determine, as reflected in the Award Agreement; provided, that the Board shall have the authority to accelerate the exercisability of any outstanding Option at such time and under such circumstances as it, in its sole discretion, deems appropriate. An Option may be exercised to the extent of any or all full shares of Stock as to which the Option has become exercisable, by giving written notice of such exercise to the Board or its designated agent.