While performing interim audit procedures of accounts receivable, numerous unexpected errors are found resulting in a change

Question:

While performing interim audit procedures of numerous unexpected errors are found resulting in a change of risk assessment. Which of the following audit responses would be most appropriate?
a. Move detailed analytical procedures from year end to interim.
b. Send negative confirmations instead of positive confirmations.
c. Increase the dollar threshold of vouching customer invoices.
d. Use more experienced audit team members to perform year-end testing.
Accounts Receivable
Accounts receivables are debts owed to your company, usually from sales on credit. Accounts receivable is business asset, the sum of the money owed to you by customers who haven’t paid.The standard procedure in business-to-business sales is that...