Bob, a salesperson at a Carpets Galore store, tells Dita, a customer, "Buy your carpet here, and I'll install it for half of what the store would charge." Dita buys the carpet, which Bob installs for half the store's price. Bob keeps the money. Bob has breached
a. no duty.
b. the duty of loyalty.
c. the duty of notification.
d. the duty of obedience