Final answer:
The best safety guideline for handling ladders is to always maintain three points of contact when ascending or descending a ladder.
Step-by-step explanation:
The safety guideline for handling ladders that BEST illustrates a safety guideline is option a) Always maintain three points of contact when ascending or descending a ladder.
This means that you should always have two hands and one foot, or two feet and one hand, touching the ladder at all times for stability and balance. This helps to prevent falls and injuries.
Learn more about ladder safety