If We Were to Intercept a Signal from a Civilization

If we were to intercept a signal from a civilization that was sent to another of its colonies on the other side of the galaxy, 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 local communication the world where the intelligent beings exist
C) a signal used for communication between a civilization's home world and another planet in its own planetary system
D) an intentional signal beacon