Day Co., a retail chain selling windows, makes two contracts, one with a wholesaler to sell windows and a second contract with a homeowner to sell windows. The contract for the sale of the windows says: "the parties agree that the parties will agree to set the price for the sale of the windows". The contract for the installation of the windows says: "the parties agree that the parties will agree to set the price for the installation of the windows". Under the circumstances: a. Both contracts fail because they are indefinite. a. The contract for the sale of the windows is invalid because of indefiniteness. b. Both contracts are valid as they are both deemed to be definite because of gap fillers. c. The contract for the installation of the windows is invalid because of indefiniteness