Which of the Following Is Not a Generally Recognised Way

Which of the following is not a generally recognised way parties might voluntarily agree to end a contract?

A) Both parties agree to mutually release each other from any future obligations.
B) The party who has performed their obligations unilaterally releases the other party from complete performance of their obligations.
C) The parties mutually agree to replace the existing agreement with a new agreement.
D) One of the parties communicates their intention to the other party to voluntarily end the contract.