Lighting systems operating at 30V or less can be concealed or extended through a building wall, floor or ceiling without regard to the wiring method used.
See answer and applicable Code reference
The correct answer is: b) False
Article 411 covers lighting systems and their associated components operating at 30V or less. As noted in Sec. 411.4(A)(1), conductors concealed or extended through walls, ceilings or floors shall be installed using an approved Chapter 3 wiring method.