An investor and his mother own 20% and 10%, respectively, of a corporation's outstanding shares, and the mother wants to sell all of her holdings. According to Rule 144, which of the following statements are TRUE?
a) She must file Form 144 to sell the shares.
b) She does not have to file Form 144 to sell the shares.
c) She is considered an affiliated person.
d) She is not considered an affiliated person.