Ann is at a live auction and she makes a bid by calling out the amount of $2500. The auctioneer announced We have a bid for $2500. There were no higher bids, but Ann changes her mind and shouts that she is withdrawing the bid. The auctioneer said that it was too late to withdraw the bid and then slammed down his hammer. Select one: a. Ann's bid is an ordinary offer that can be revoked. b. Ann's bid is final and cannot be revoked. c. Anns bid has been rejected by the auctioneer. d. Ann's bid was accepted by the auctioneer before the slam of the hammer.