You Are Assisting a Customer Who Has Issues with His

You are assisting a customer who has issues with his PLC home automation system. He complains that three of the lights in a room turn ON and OFF intermittently. Which of the following should you ask the customer first?

A) Are the light bulbs in the room securely installed?
B) Have you removed or replaced the PLC lighting modules?
C) Have you added any new electrical devices in service at home?
D) Have you plugged any new electrical devices into the electrical circuits in the room in question?

Correct Answer:

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