How Does an Offer of a Unilateral Contract Differ from That

How does an offer of a unilateral contract differ from that of a bilateral contract?

A) An offer of a unilateral contract does not require acceptance to be communicated, but a bilateral one does.
B) The supply of consideration is not mandatory for the valid acceptance of an offer of a unilateral contract.
C) The informal nature of an offer of a unilateral contract means it is reserved for domestic transactions only, whereas a bilateral one is suitable for both domestic and commercial contracts.
D) An offer of a unilateral contract entails the offeror promising something in return for the offeree doing a specified act, but the offeree does not promise to do the act, whereas a bilateral contract involves an exchange of promises.