If We Were to Detect Radio and TV Signals That

Multiple Choice

If we were to detect radio and TV signals that had leaked out into space from another civilization, this would be an example of

A) a signal used for communication between a civilization's home world and another star system
B) a signal used for communication between a civilization's home world and another planet in its own planetary system
C) a signal used for local communication in the world where the intelligent beings exist
D) an intentional signal beacon