$29.$ A customer went into a store and saw a beautiful leather jacket bearing a price tag of $$29.$ The customer handed the cashier a $$50$ bill and said, "I accept. We have a deal." The cashier then noticed the price tag and told the customer an error had been made and that the price was $$229.$ In this case:

a$.$ the customer validly accepted the store$$s offer.

b$.$ the price tag was a firm offer.

c$.$ no contract was formed because the customer's offer was refused.

d$.$ the customer is the offeree.