Which of these is NOT a method of terminating a contract?

The choice that is NOT a method of terminating a contract is negotiation. Terminating a contract typically involves clear legal actions or conditions that result in the end of that contract.

Mutual agreement allows both parties to consent to end the contract, providing a straightforward path to termination. Performance indicates that the obligations under the contract have been fulfilled as agreed, thus terminating the contract through completion. Impossibility of performance arises when unforeseen circumstances make it impossible for one or both parties to fulfill their obligations under the contract, which also serves as a legitimate basis for termination.

Negotiation, while important for discussions, amendments, or resolving disputes, does not inherently terminate a contract on its own. It may lead to a mutual agreement or other actions that could result in termination, but it does not qualify as a direct method for concluding a contract.