Robert reads an ad in the newspaper that has the following language: "Come visit our new Dodge dealership! The first five visitors to help us open the doors at 6:00 a.m. Wednesday morning get a new Dodge Charger for a mere $13,000!" Robert goes to the dealership on Wednesday morning and is one of the first five visitors. Robert has:
Made a valid unilateral contract with the dealership.
Not made a valid contract with the dealership.
Received only an invitation to make an offer from the dealership.
Responded to an advertisement, not an offer or a contract.