Two types of earthings are provided:

⇒ Equipment earthing is the connection done to a metal link between the body and the given electrical appliance or by neutral point in the case we have to dig deeper to the ground. 

⇒ The neutral grounding is connecting the neutral point of the supply system or rotating machine or Transformer to the earth directly to some electrical circuit elements. 

⇒ Equipment earthing is provided for safety of personal or to prevent least damage of the equipment and the due to the result of heavy flow current.

Final Answer: Hence, the correct option is A, i.e Safety of human being