This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to clean a led screen
Read the owner's manual.
Most devices with led screens come with an owner's manual. That manual will often describe the best method to clean the screen, as well as the best cleaner to use.

Select from the following.
(A). It will also tell you what to avoid. If you can't find your manual, you can often find it online by searching with the product number.
(B). Most handheld tvs come with an owner's manual. This manual includes detailed instructions on how to properly turn off power to the device after hand cleaning it.
(C). An owner's manual will usually be at least four pages long. If you read the manual with instructions written in it, you will be able to determine the best way to clean the device.
(D). Usually, you will be able to find the owner's manual in the front of the device's on/off box. Unscrew the top panel of the circuit board.
The answer is:
(A).