Determine whether each of the following is an internal control strength or an internal control weakness. If weakness, explain why.
a) Vouchers and all supporting documents are perforated with a PAID designation after being paid by the treasurer.
b)All sales are rung up on the cash register, and a receipt is given to the customer. All sales are recorded on a record locked inside the cash register.
c)The bank reconciliation is prepared by the accountant.