When Do Mailings Sent to Facilitate Concealment of a Fraudulent

Multiple Choice

When do mailings sent to facilitate concealment of a fraudulent scheme - to avoid detection,prosecution or conviction - fall within the federal mail fraud statute?

A) As long as the mailings are sent via U.S.mail,it is irrelevant when they are sent.
B) When they are sent before the scheme is completed.
C) As long as the mailings are sent via U.S.mail,UPS or FedEx,it is irrelevant when they are sent.
D) When they are sent after the scheme is completed.
E) When they are sent in conjunction with the scheme.