David owns a successful local pharmacy but has decided to retire and sell the pharmacy.Claire expresses an interest in buying the pharmacy, so David makes an offer to sell to Claire.However, Rhonda offers David considerably more than his offer to Claire, so he sells the pharmacy to Rhonda.Claire is angry because if she had known about Rhonda's offer, she would have matched it.Which of the following is true?

Group of answer choices

David cannot revoke his offer until Claire has rejected it.

Since David had an offer to Claire outstanding, he cannot sell the pharmacy to Rhonda without giving Claire an opportunity to match Rhonda's offer.

David can revoke his offer to Claire by selling the pharmacy to Rhonda.

David must tell Claire expressly that he is revoking his offer to sell the pharmacy to her.