On June 1, John offers to remodel David’s Kitchen for $5,000. When making his offer, John tells David that, because his schedule changes very often, David must accept by email or over the phone. David mails an acceptance to John on June 4. On June 6, John takes on another project and calls David to revoke his offer. David tells John that he already mailed an acceptance. John receives the acceptance on June 7. Has a contract been formed?
Question 8 options:

Yes, because there is an offer, acceptance, and consideration.

Yes, because David accepted John’s offer on June 4 under the mailbox rule.

No, because John revoked his offer before David’s acceptance was effective.

No, because of a failure of consideration.