Which one is a correct statement of the law regarding a unilateral contract?

A) If an offer to enter into a unilateral contract is made to B, B may validly accept the offer by telling the offeror "I accept your offer, and will do the requested" or using other words to the same effect.

B) The completion of the conduct requested in an offer to enter into a unilateral contract is the acceptance of the offer, and acceptance must be communicated to the offeror in order to be effective. Therefore, before the offeree starts to perform the conduct and after the offeree has completed the conduct, the offeree must notify the offeror of the start and completion. Otherwise, there would be no unilateral contract.

C) A unilateral contract is one that really has only one party to the contract. That is in contrast to a bilateral contract that has two parties to it.

D) While the offeree's complete performance of the conduct is effective acceptance of the offer to enter into a unilateral contract, courts have held that the offeror is not allowed to withdraw their offer once the offeree has started to perform the conduct but has not completed the conduct yet.