Andrea, an accountant, performs some work for her client, Superstore, Inc. At one point, Superstore asks Andrea for her working papers. The working papers of an accountant can best be described as: a. the privileged communications between an accountant and her or his attorney. b. depositions conducted by the accountant's attorney. c. the materials the accountant uses during the course of a typical business day. d. the various documents used and developed by an accountant during an audit