Wally hires Hillary to negotiate the purchase of a racing boat for Wally. Hillary decides to buy from April a racing boat meeting Wally's specifications. Hillary tells April that the purchase is really being made by Wally, and Hillary and April sign a written contract, with Hillary signing on Wally's behalf. Based on all this:

a.Wally is not liable on this contract, but Hillary is liable.

b.Neither Hillary nor Wally can be held liable on this contract.

c.Hillary is not liable on this contract. but Wally is liable.

d.Either Hillary or Wally could be held liable on this contract.