Irene Was Looking for a Radio Station That Was Not

Irene was looking for a radio station that was not playing commercials.As she searched,she heard a commercial for a local bank using an instrumental version of a folk song her parents used to sing.A few stations later,she heard the same song being played as the background music in a commercial for a health spa.The instrumental was more than likely:

A) stock music.
B) part of a song inventory.
C) digitally-masked music.
D) from a music warehouse.
E) mined music.