Final answer:
Enclosed, accessible spaces under stairs should be protected with a handrail or a guardrail to ensure safety.
Step-by-step explanation:
Enclosed, accessible spaces under stairs should be protected on the enclosed side with a handrail or a guardrail.
A handrail is a horizontal or sloping rail intended for grasping by the hand, which provides stability and support. It is typically placed on the open side of a staircase or ramp.
A guardrail, on the other hand, is a vertical barrier erected along the exposed side of a stairway, platform, or balcony to prevent people from falling. It is usually required in situations where there is a risk of a fall from a certain height.