Question

what is the primary purpose of a machine guard on a tool?
to prevent theft
to protect the tool from damage
to reduce insurance rates
to protect the worker from rotating parts

Explanation:

Machine guards on tools are safety - features. Their main role is to shield workers from potential hazards like moving or rotating parts that can cause injury. They are not related to preventing theft, protecting the tool from damage, or reducing insurance rates.

Answer:

to protect the worker from rotating parts