Explanation: A Ground Fault Interrupter (GFI) socket is a crucial safety device designed to protect against electrical shock. It works by continuously monitoring the current flowing in the "hot" (live) wire and comparing it to the current returning through the "neutral" wire. In a healthy circuit, these currents should be equal. If there's an imbalance – even a very small one, typically 5 milliamps – it indicates that current is leaking out of the circuit through an unintended path, such as a person's body touching a faulty appliance (a "ground fault"). The GFI senses this imbalance and rapidly shuts off the power, preventing a potentially fatal shock. Option B is incorrect; gold plating relates to corrosion resistance, not GFI function. Option C describes a child-resistant receptacle, which uses internal shutters, not a GFI. Option D is incorrect; a GFI is a safety device, not designed to increase current capacity, which is determined by wiring and circuit breakers.