They are:
(1) the existence of a previous valid obligation;
(2) the agreement of all parties to the new contract;
(3) the extinguishment of the old contract; and
(4) the validity of the new one.
They are:
(1) the existence of a previous valid obligation;
(2) the agreement of all parties to the new contract;
(3) the extinguishment of the old contract; and
(4) the validity of the new one.