What is the primary safety function of a Ground Fault Circuit Interrupter (GFCI) outlet, commonly required in areas like bathrooms, kitchens, and outdoors?

✓ Correct Answer: Option B

A GFCI outlet is designed to quickly detect very small differences in current flowing into and out of a circuit. If it senses an imbalance, indicating current is leaking through an unintended path (like a person), it trips and shuts off the power within milliseconds, effectively preventing severe electric shock.