Alice Able, on behalf of Pix Co., entered into a contract with Sky Co. by which Sky agreed to sell computer equipment to Pix. Able exceeded her actual authority by entering into a contract with Sky. if Pix does not want to honor the contract, it will nonetheless be held liable if Sky can prove that: a. Pix caused Sky to believe that Abe had authority to bind Pix. b. Abe caused Sky to believe Abe had the authority to bind Pix. c. Either Pix or Abe caused Sky to believe Abe had the authority to bind Pix. d. The agency relationship between Pix and Abe was in a signed writing