Question

what do guards do to protect the worker? select the best option. detects contact with the worker places a physical barrier between the worker and machine monitors for worker contact acts as a warning sign for workers

Explanation:

Guards in a work - related context are physical barriers that separate workers from machinery to prevent accidental contact and injury. Detecting contact or monitoring for contact are functions of sensors rather than guards. A guard is not primarily a warning sign but a physical prevention measure.

Answer:

Places a physical barrier between the worker and machine