Several buyers are competing for the last available home in a desirable new subdivision. One buyer calls the owner-developer directly on the phone and offers $10,000 over and above the listed price. Thedeveloper accepts the offer. At this point,a. the parties have a valid, enforceable sale contract on the homeb. the parties have completed a verba, executor contractc. the parties may not cancel their contractd. the developer could not entertain other offers on the property