This excerpt taken from the SONE DEF 14A filed Apr 16, 2008.
8.6. Method of Exercise.
An Option that is exercisable may be exercised by the Grantees delivery to the Company of written notice of exercise on any business day, at the Companys principal office, on the form specified by the Company. Such notice shall specify the number of shares of Stock with respect to which the Option is being exercised and shall be accompanied by payment in full of the Option Price of the shares for which the Option is being exercised. The minimum number of shares of Stock with respect to which an Option may be exercised, in whole or in part, at any time shall be the lesser of (i) 100 shares or such lesser number set forth in the applicable Award Agreement and (ii) the maximum number of shares available for purchase under the Option at the time of exercise.