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

How to clean a dryer drum
Unplug the dryer.
Before you start, you should unplug the dryer to prevent accidents. The plug is usually located behind the machine.

Choose your answer from:
(1). If there is an inside fitting you can remove it and dispose of it. Run your dryer on high heat..
(2). If there is static behind the agitator coils, remove this and check for static. Some models may even have a switch to turn on or off..
(3). It will be located roughly 1 foot (50 cm) from the dryer. Run the dryer on neutral mode..
(4). Test it to be sure that you have unplugged it correctly. If you have a gas dryer, you will also want to shut off the gas..
The answer is:
(4).