Which device sends the information to the circuit breaker to interrupt the circuit in case of fault?

Circuit breaker itself does this function.

Which device sends the information to the circuit breaker to interrupt

1.	Which device sends the information to the circuit breaker to interrupt the circuit in case of fault?
A.	Switch
B.	Relay
C.	Circuit breaker itself does this function.
D.	Fuse.
Answer» C. Circuit breaker itself does this function.