Which of the Following Statements Regarding Stock Options Is True

Which of the following statements regarding stock options is true?

A) An employee will exercise a stock option only when the current market price of the stock is less than the option price.
B) Unexercised options may be sold or transferred in the open market.
C) Employee stock options are a restricted form of a call option.
D) Companies expense stock-based compensation at the fair value of the stock on the expected date of exercise.