The long slot that is present in a 15-ampere, 125-volt, receptacle is known as the grounded conductor.
What is purpose of the long slot in the receptacle?
The long slot is the grounded conductor that is placed in the receptacle to meet with relevant National Electrical Codes (NEC).
The grounded conductor is meant to connect to the ground either directly or indirectly for safety purposes.
In conclusion, option A is correct.
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