20: Henry told Jack that Tom was his leasing agent. Based on this representation, Jack signed a three- year lease with Tom on building owned by Henry Jack spent a considerable sum on special equipment for the property. Henry now claims that Tom was not his agent because there was no written agency. A court would likely decide that O (a) Henry need not lease to Jack because Tom was not appointed in writing. (b) Henry is estopped from denying the agency. O (C) an agency by ratification exists. O (d) Tom was a dual agent