Which of the following statements about stock option vesting schedules is (are) correct? IGraded vesting may call for a portion of the options to vest each year. IICliff vesting may provide that all options can be exercised at one time. IIIThe vesting schedule can be based on the company or the employee meeting specified performance goals. (A)I only(C)II and III only (B)I and II only(D)I, II, and III