What describes the Black Market Peso Exchange money laundering method?

A.
The best known money laundering method used by known terrorists

B.
An undercover technique to identify politically exposed persons who may assist money launderers

C.
A method primarily used by narcotics traffickers to transfer value back to the source country

D.
A method used to smuggle dollars or pesos across that border from the U.S. to Mexico, and vice versa