A user calls the corporate helpdesk stating that their battery is not charging. The operating system shows that there is a problem with the battery. Which of the following should the technician do FIRST to determine what the issue is without erasing the users unsaved data?
A. Using a known-good computer of the same type, switch batteries between the two laptops.
B. Remove the A/C adapter while the system is running and observe if the screen dims.
C. Completely shut down the laptop, remove the A/C power source and restart the laptop.
D. Using a known-good computer of the same type, switch A/C adapters between the two laptops.