Which of the Following Is Correct with Respect to a Bank

Which of the following is correct with respect to a bank customer's duty to discover and report unauthorized signatures?

A) The customer is required to exercise reasonable promptness in examining the bank statement.
B) This duty of examination includes the signatures of payees or indorsers.
C) The bank is liable on all items with unauthorized signatures even if these canceled checks were returned to the customer four years prior to the discovery of the alterations.
D) The bank customer must report an unauthorized indorsement within one year of its occurrence.