In a contract, what is needed for the offeree's knowledge to count as completion of acceptance?

For acceptance of an offer to be considered complete, it is essential that the offer has actually reached the offeree. Acceptance cannot occur unless the offeree is aware of the existence of the offer. This aligns with the fundamental principles of contract law, which state that an offer must be communicated to the offeree for them to accept it. If the offeree has no knowledge of the offer, they cannot act upon it, thus rendering the acceptance invalid.

The other options touch on aspects that may enhance the clarity and formalities of the offer or acceptance but are not prerequisite requirements for the acceptance to be valid in the eyes of the law. For instance, while having the offer in writing can create a clear record, it is not necessary in all cases where verbal agreements are acceptable. Full discussion of the offer may strengthen understanding between parties but is not required for acceptance. Acknowledgment by both parties may solidify an agreement but is not a requisite condition for the offeree's acceptance to be valid legally. The key factor remains that the offer must reach the offeree, enabling them to know and decide to accept the terms.