The accounting departmentasks you about a suspiciousinvoice they received from anew partner firm you work withoften and identifies a few redflags they'd like you to explain.Which of the following couldqualify as "red flag" in thisinstance:

A$,$ Significant payments paid prior to any work being performed by the partner firm.

B$.$ Payments made on the same day of the week each month.

C$.$ Payments made in cash with no receipts.

D$.$ Both A and C