Final answer:
A handrail consists of a top rail, midrail, and posts. It is typically found on stairs, balconies, or elevated areas to provide support and safety.
Step-by-step explanation:
The subject of this question is handrail.
A handrail typically consists of a top rail, midrail, and posts. It is designed to provide support and safety for people walking along a staircase, balcony, or any elevated area
According to the question, a handrail must be 42 inches in height from the upper surface of the top rail to the floor, with a midrail height of 21 inches.