Stewart wrote Blackwell and offered to sell Blackwell an office building for $100,000. This offer stated that it would expire in 30 days after January 1, 1990. Stewart changed his mind and does not want to be bound by his offer. Which one of the following is most correct?

Group of answer choices

If Blackwell rejects the offer on January 10, he cannot accept it within the remaining time period thereby creating a valid contract.

The offer cannot be withdrawn for the stated period of time.

The offer will not expire prior to the 30 days mentioned even if Stewart sells the property to a third person and notifies Blackwell.

If Blackwell telephoned Stewart on February 1 and unequivocally accepted the offer, it would be a contract as long as the offer had not been revoked.

The offer is open for a reasonable time not to exceed the years.