Which of the following is the best description of a management representation letter?

a$.$ The letter is signed by the CFO, dated as of the balance sheet date, and prepared by the auditor.

b$.$ The letter is signed by both the CEO and CFO, dated as of the audit report date, and is typically prepared by the auditor.

c$.$ The letter is prepared by management and signed by the auditor. It is dated as of the audit report date.

d$.$ The letter is prepared and signed by the auditor and witnessed by the CEO and CFO. It is dated as of the balance sheet date.