Grace Williams purchased plates and cups from China Wholesalers for sale to retail customers at her store. Grace and China had little paperwork, just the invoices from the shipments. Otherwise, they operated by phone and shipments in response to the phone call requests. Grace’s orders range from $2000-$10,000. China decided to clean up its internal controls and documentation and asked Grace to sign a form agreement. Grace is not sure that she wants to sign a contract. Which of the following is correct, given Grace’s circumstances? a. There need not be a written contract because the parties have a longstanding relationship. b. There must be a written contract for any part of this relationship to be enforceable. c. Pattern or practice is sufficient writing to establish a contract. d. If China simply confirms each order from Grace, there is sufficient record of a contract.