Bob worked as the agent of Anne. Anne was in the business of buying antique watches and selling them to the public. She became so successful at this that people began to become reluctant to sell to her, feeling that if she was buying the watch, it probably could be sold for more. Anne instructed Bob to purchase several watches but not to reveal that the purchases were being made on her behalf. Bob contracted to buy several watches and gave his own check as down payment to keep Anne's identity concealed. Although Anne had authorized the contracts, she reneged on the contracts. Bob thereupon told the seller what had happened and stopped payment on the down payment check. The seller of the watches sued Anne on the bounced check and for breach of contract. Bob was sued on the same causes of action. Is Bob liable? a. No, Bob isn't liable because he stopped payment of his check. b. No, Bob isn't liable since he was working as an agent. C. No, Anne is the only liable party d. Yes, Bob is liable since he contracted in his own name