Verlon Mills thinks the following mistakes may have been made in his accounting records: (0) a credit sale was recorded at the wrong value in the sales account (1) a cheque issued to a credit supplier was debited to the purchases account. The credit entry was made correctly. Which of the mistake(s) will be revealed by extracting a trial balance? a. both (i) and (ii) b. (ii) only neither (i) nor (ii) d. (1) only