When is a contract considered executed?

A contract is considered executed when all parties involved have accepted all the terms as stated, which includes any modifications. This means that both the offeror and the offeree have agreed to the final terms of the contract, making it an enforceable agreement. The process of acceptance solidifies the intention of both parties to be bound by the contract's terms.

In contrast, the other options do not accurately depict the conditions under which a contract is executed. The signing by only one party does not complete the contract; both parties must sign for it to be enforceable. Notarization, while it can add credibility and may be necessary for certain types of contracts, does not itself execute the contract. Furthermore, having no counteroffers does not pertain to the execution of a contract, as it simply indicates that the terms proposed were accepted without modification. Execution hinges on mutual acceptance of the terms, not the absence of counteroffers or additional formalities like notarization.