what is the minimum number of feet the top of a ladder should extend above the point where it touches a…

what is the minimum number of feet the top of a ladder should extend above the point where it touches a platform or roof?\no 2\no 3\no 4\no 5
Answer
Brief Explanations:
This is a safety - related standard for ladders. It is commonly recommended that the top of a ladder should extend at least 3 feet above the point where it touches a platform or roof for safety and stability during climbing up and down.
Answer:
B. 3'