On June 10, a prospective buyer gave a deposit to a broker and signed the usual form of an offer to purchase property. The deposit form included the statement, this offer is irrevocable for five days. On June 11, and before the offer had been accepted by the seller, the buyer contacted the broker and withdrew his offer and demanded the return of his deposit. The broker
a) Must return the deposit as the offer was withdrawn within the stated period
b) Can keep the deposit as liquidated damages
c) Should consult with legal counsel before deciding
d) Is not obligated to return the deposit