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Question:

When checking lights, you should

A Both answers are correct.
Explaination

In Step 4 (Turn Off Engine and Check Lights) of the Seven-Step Inspection Method, set the parking brake and turn off the engine. Turn on the low-beam headlights and four-way flashers. In Step 5 (Walk-Around Inspection), leave the cab, walk to the front of your vehicle, and make sure that these lights are working.