On May 1, Lucas wanted to buy a new car. Then he found a Ford Mustang worth 20,000 dollars on the Internet. So he contacted the seller, and the seller said that it would take him some time to clean and maintain the car. So Lucas can spend a week considering whether to buy, but he must decide before May 8. Which of the following options is correct?

1.On May 5th, if the seller informs Lucas that he has sold the car, then Lucas can sue him for breach of contract.

2.On May 3rd, Lucas sent an email to the seller. He thought that 20,000 US dollars was a bit expensive and hoped to lower the price. This meant that he proposed a counteroffer and then rejected the original offer.

3. On May 5th, Lucas sent a letter telling the seller that he didn't need a car anymore. But on May 7th, he sent an email to the seller telling him to change his mind, so this contract is currently enforceable.

4. If Lucas sent a letter on May 7th, it indicated that he accepted the contract, but the seller did not receive the letter until May 10th. It shows that Lucas did not sign a contract to purchase the car with the seller because he did not accept the agreement in time.