On November 1, 2011, Ted sent a telegram to Zena offering to sell a rare vase. The offer required that Zena's acceptance telegram be sent on or before 5:00 p.m. on November 2, 2011. On November 2, 201 at 3:00 p.m., Zena sent an acceptance by overnight mail. It did not reach Ted until November 5, 2011. Ted refused to complete the sale to Zena. Is there an enforceable contract?
a. No, because Zena did not accept by telegram.
b. No, because the offer required receipt of the acceptance within the time specified.
c. Yes, because the acceptance was effective when sent.
d. Yes, because the acceptance was made within the time specified.