Question

what is a key requirement for flexible cords used with equipment that needs grounding? they must be colorful to indicate they are grounded they should be equipped with an equipment grounding conductor they must be waterproof they should be used without attachment plugs

Explanation:

For equipment that needs grounding, a key requirement for flexible cords is having an equipment - grounding conductor to safely direct fault currents to the ground, reducing electrical shock risks. Colorfulness is not a requirement for grounding indication, waterproofing is not related to grounding, and using without attachment plugs is not a grounding - related key requirement.

Answer:

B. They should be equipped with an equipment grounding conductor