When is a revocation of an offer considered effective?

A revocation of an offer is considered effective when it is received by the offeree. This is based on the principle that the offeree must be aware of the revocation in order for it to affect their ability to accept the offer. Until the offeree receives the notice of revocation, they may still act under the assumption that the offer is valid and may choose to accept it.

Timing plays a crucial role in contract law. While an offer can be revoked at any time before it is accepted, the crucial factor is that the offeree must be informed of this revocation for it to take effect. Therefore, simply mailing or postmarking a revocation does not make it effective; it requires actual receipt by the offeree to have any legal standing.

This ensures clarity and mutual agreement between the parties involved, which is a foundational aspect of contract formation and negotiation. The other options relate to concepts of when an offer is communicated but don't accurately capture the requirement that the offeree must be aware of the revocation for it to be considered effective.