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John makes an offer to sell some land to Maxwell for $25,000, and tells Maxwell that he will give him three days in which to make a decision.Maxwell says "I accept your three day time period."The next day, John changes his mind and decides not to sell.Which of the following statements is correct?

Group of answer choices

1 John's offer is not revocable for a reasonable period of time.

2 John may revoke his offer even though he said he would keep it open for three days.

3 John cannot revoke his offer if the promise of a three day period was put in writing.

4 Offers that state a time period are not revocable during the stated time.

It's just multiple choice question. Please don't explain the answer and give me your answer as soon as possible

Just give me the answer only.