Which of the Following Would Indicate Poor Internal Control Over

Which of the following would indicate poor internal control over Accounts Receivable?

A) The person handling cash receipts passes the receipts to someone who enters them into Accounts Receivable.
B) The same person handling cash receipts also records the Accounts Receivable transactions.
C) The mailroom employees open the mail and give the cash receipts to another employee.
D) The person who handles Accounts Receivable would not write off accounts as uncollectible.