Which of the following statements are true about a surge suppressor?
Each correct answer represents a complete solution. Choose all that apply.

A.
It is an electrical apparatus that provides emergency power to a load when the input power
source, typically the utility mains, fails.

B.
It protects systems from lightning, the most familiar source of power surges.

C.
It is an appliance designed to protect electrical devices from voltage spikes.

D.
It attempts to regulate the voltage supplied to an electric device by either blocking or by shorting
to ground voltages above a safe threshold.