Bob, a merchant, makes an offer to Linda, another merchant, to buy 1,000 of her widgets in a signed letter containing all necessary terms of the offer. The letter states that Bob will keep the offer open for three weeks from the day the offeree receives it. One week later, Bob writes another letter to Linda attempting to revoke his offer. Linda writes a letter to Bob accepting Bob's original offer before she receives his revocation. Which of the following is true regarding this situation? Multiple Choice O Promissory estoppel prevents the formation of a contract in this situation, The offer cannot be revoked since it is an option offer. O Linda's acceptance is effective and a contract is created Bob's revocation is effective and no contract is created