Final answer:
The correct answer is option d. The mailbox rule applies when determining the effective moment of an acceptance in contract law, and it is considered effective upon dispatch, not upon receipt. Thus, it specifically applies to option d - acceptance. This rule does not apply to offers, invitations for offers, or revocation of offers, which are effective upon receipt.
Step-by-step explanation:
The mailbox rule, also known as the posting rule, is a legal concept that applies to contract law, specifically in the area of offer and acceptance in forming a contract. The mailbox rule determines the exact moment an acceptance of an offer becomes effective. Under this rule, an acceptance is deemed effective when it is dispatched, not when it is received by the offeror. This means that as long as the acceptance is properly addressed and sent via a method suggested or accepted by the offeror, the contract is considered to be formed at the moment the acceptance is sent.
The mailbox rule applies specifically to acceptance of an offer. It does not apply to offers, invitations for offers, or revocation of offers. These other contract actions are effective only upon receipt, not upon dispatch. For example, a revocation of an offer does not take effect until it is communicated to the offeree. Similarly, an offer or invitation for offers must be received by the potential offeree for them to be able to accept it.
Therefore, in regards to the student's question, the mailbox rule applies strictly to option d - acceptance. It is important to note that in some scenarios, such as instantaneous forms of communication like email or fax, the mailbox rule may not apply, and the acceptance is only effective when it is actually received by the offeror.