t Walter Conn, CPA, is engaged to audi the financial statements of Bingo Wholesaling for the year enderi Derember 31, 20XD. Conn 0tained and dcoumented ai11' nderstanding of the client and its environment, including intemal control over the business PENEs relaing to accoints receivable. He assessed the risks of mateil misstetement for all of the assertions about accounts reccivaeae level. Con requested and cblained from Bingo an aged accouns reerivable schedule listing the total aount owed by cach customer as of December 31, 20xo Whai additional substantive andit piocedu es should Conn consides applyng cccounts receivnblc? aucditing the L Iccatify the cortrol that is most Bkly o preent the concealment of a cash sho (1) Write-offs must be approved by aresponsible official after revicw of credile (2) Write-olfs nust be auproved by te as ee vable dei (3) Write-otfs must be authorizcd by the stipping depaitiment () Write otts must te suppoted by an ogins chedule showing that orly ecervatles overdue by several months have bean written off