Which of the following is the BEST way to determine if the LCD screen is the cause of the issue?

A technician is onsite to troubleshoot a distorted image on a laptop.
Which of the following is the BEST way to determine if the LCD screen is the cause of the issue?
A. Disable the onboard video card.
B. Adjust the resolution of the laptop.
C. Reinstall video driver in Windows operating system.
D. Connect an external monitor to the laptop.

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