Footlights in a stage that are designed to disappear into a storage recess when not in use must be designed so that _____.
a. their external temperature cannot exceed 125°F (51.6°C)
b. the power supply is automatically disconnected when the lights are retracted
c. no flammable materials are within 12 inches (30.5 cm)
d. their wattage is automatically reduced when the lights are retracted
b. the power supply is automatically disconnected when the lights are retracted
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