A merchant-seller's form states that the form cannot be modified or varied. The merchant-purchaser accepts, by letter, the essential terms of the seller's form and keeps the seller's form for its records. a. There is a contract, and its terms cannot later be modified or varied.
b. There is a contract, and its terms can be later modified or varied since the buyer did not separately sign the seller's provision against modification.
c. There is a contract, and its terms cannot be later varied because contracts cannot be altered after they are made.
d. There is no contract.
e. There is a contract and the terms may be subsequently modified or varied because the contract was integrated.