Correct answer is A:

210.12 (B)
Dwelling Unit Bedrooms. All 120-volt, single phase, 15- and 20-ampere branch circuits supplying outlets installed in dwelling unit bedrooms shall be protected by a listed arc-fault circuit interrupter, combination type installed to provide protection of the branch circuit.

Article 100

Device. A unit of an electrical system that is intended to carry or control but not utilize electric energy.

Outlet. A point on the wiring system at which current is taken to supply utilization equipment.

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