A enters into an agreement with B for buying certain machine parts for their project. Before the agreement ends, A and B change certain terms of the agreement and include those terms in the agreement. This is a case of Discharge___________.

by performance by agreement by lapse of time by operation of law

by agreement

A enters into an agreement with B for buying certain machine parts for their project. Before the agreement ends, A and B change certain terms of the agreement and include those terms in the agreement. This is a case of Discharge by agreement.