Subject to the provisions of section 42a-2-612 on breach in installment contracts and unless otherwise agreed under sections 42a-2-718 and 42a-2-719 on contractual limitations of remedy, if the goods or the tender of delivery fail in any respect to conform to the contract, the buyer may (a) reject the whole; or (b) accept the whole; or (c) accept any commercial unit or units and reject the rest.