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