Alpha Company offers to sell Beta, Inc., 1,000 computers for a $1 million, states that the offer will be open for six days, and asks for a response by fax. On the fourth day, Beta sends an acceptance to Alpha via the mail, which is received on the sixth day. In this deal:
a. a contract is formed.
b. no contract is formed, because Alpha asked for a response by fax.
c. no contract is formed, because Alpha received the acceptance late.
d. no contract is formed, because Beta sent the acceptance late.