Final answer:
Outlets supplying power to a hot tub must be grounded, GFCI protected, and weatherproof to ensure safety against electrical hazards.
Step-by-step explanation:
Any outlet that supplies power to a hot tub shall be grounded, GFCI protected, and weatherproof. This is important because it ensures safety by mitigating the risk of electrical shock and protecting against electrical faults. A three-wire system, which includes a live/hot, neutral, and ground wire, is used to protect against thermal and shock hazards. The neutral and case of the appliance are grounded to ensure they are at zero volts relative to the earth, making them safe to touch even if the insulation is damaged.
A ground fault circuit interrupter (GFCI) enhances safety by detecting current loss to unintended paths and preventing shock. GFCIs are especially common in areas with moisture, such as bathrooms and kitchens, and are critical for outdoor appliances like hot tubs. Additionally, outlets should be weatherproof to protect against outdoor elements. Therefore, the correct answer to the question is 'All of the above'.