Question

what is one of the most common grounding systems used for protection against accidental electrical shock?
two - wire system
three - wire system
four - wire system

Explanation:

The three - wire system includes a ground wire which provides a path for fault current to flow safely to the earth, protecting against accidental electrical shock. Two - wire systems lack a dedicated ground wire, and four - wire systems are more complex and not the most common for basic shock protection.

Answer:

B. three - wire system