Joe Sends Sanjay an Offer Via Email from His Toronto

Joe sends Sanjay an offer via email from his Toronto office. The offer contains a provision indicating the offer expires at 5:00 PM Toronto time. Sanjay, who lives in Vancouver, replies accepting Joe's offer at 4:00 PM Vancouver time. Joe received Sanjay's email acceptance at 9:00 AM the next day. Which of the following statements is true? (Note the three hour time difference between Toronto and Vancouver)

A) Joe's offer had expired.
B) Joe and Sanjay had a binding contract, since Sanjay had accepted by 4:00 Vancouver time.
C) A binding contract had been formed, once Joe opened Sanjay's email acceptance the next day.
D) Once Sanjay had sent the email,, a binding contract had been formed, regardless of what time Joe had received the email.
E) The contract became binding once Joe had made the offer.