A risk of material misstatement in accounts receivable associated with the allocation balance- related audit objective is that "long-term service revenue is recorded as current revenue or in the wrong period, overstating revenue and accounts receivable." Which of the following tests of detail of balances would respond to this risk? O a. Read customer contracts and audit the criteria used to allocate revenue to components of the sales contract. O b. Read the notes to the financial statements and compare to audited financial information. Oc. Check cash received after the year end and trace to accounts receivable master file. O d. Enquire with management about the process used to make sure that revenue is recorded in the correct period