Final answer:
GFCIs are critical safety devices in bathrooms, and light switches must be at least 6 feet away from the edge of the bathtub or shower to ensure safety against electric shocks.
Step-by-step explanation:
A ground fault circuit interrupter (GFCI) is an essential safety device designed to prevent electric shock by interrupting the circuit when it detects imbalance between the incoming and outgoing current. The National Electrical Code (NEC) recommends that any electrical outlet within 6 feet of water sources must be protected by a Class A-type GFCI to ensure safety. Furthermore, the light switch controlling a luminaire should also be placed at a safe distance, at least 6 feet from the edge of the bathtub or shower, to reduce the risk of electric shock to a person who might be in contact with water.