Final answer:
The correct answer is a. Electrical switch turned off. Lock-out/tag-out procedures are safety measures used to prevent the accidental release of stored energy from equipment during maintenance or repair.
Step-by-step explanation:
The correct answer is a. Electrical switch turned off. Lock-out/tag-out procedures are safety measures used to prevent the accidental release of stored energy from equipment during maintenance or repair. The purpose is to protect workers from hazardous conditions that could result in injury or death. Examples of lock-out/tag-out procedures include turning off electrical switches, disconnecting drive mechanisms, blocking and bleeding hydraulic lines, and chaining and locking liquid valves. However, in this case, turning off an electrical switch is not an example of lock-out/tag-out procedures. It is important to use lock-out/tag-out procedures to isolate and control all sources of energy before performing any maintenance or repair tasks.