In which one of the following instances would the seller most likely succeed in an attempt to escape liability by the use of an exemption clause when the buyer suffers a loss?

a.The buyer of an expensive computer software program received, a month after the sale, an invoice on which was printed an exemption clause that he hadn't been shown before.

b.The store had posted at the entrance to the dressing rooms a large sign reading "Not responsible for stolen articles," and the customer lost a briefcase in a fire that swept through the dressing rooms.

c.Ralph bought a used lawnmower under a written and signed contract that contained an "as is" clause.

d.There has been a breach of the fundamental obligation of the contract, and the court holds that on its true construction the parties did not mean it to cover a serious breach.

e.A consumer transaction is involved and provincial legislation prohibits such exemption clauses in consumer transactions.