Centrex Computer Company offers to sell Deluxe Vehicle Sales Corporation 1,000 computers for a $500,000, states that the offer will be open for six days, and asks for a response by fax. On the fourth day, Deluxe sends an acceptance to Centrex via the mail, which is received on the sixth day. In this deal

a. a contract is formed.
b. no contract is formed, because Centrex asked for a response by fax.
c. no contract is formed, because Centrex received the acceptance late.
d. no contract is formed, because Deluxe sent the acceptance late.

Answer: a. a contract is formed.