Multi-select problem: How does the next paragraph end?

How to clean a central air conditioner
Shut off power to the unit.
There should be an outdoor shutoff near the condenser unit. This will resemble a square box on the wall of the apartment or house.

Options are: (I) Turn on your washer and dryer and then unplug it from the power line. Loosen the hose valve that needs removal, then and you will be able to remove the cold air leaving the unit.; (II) Inside, look for a switch that you can slide to the " off " position. If there is no switch, you'll need to manually pull the plug which feeds power to the condenser.; (III) If the mercury turns from the normal color to a bright yellow, perform an electricity shutoff. This will diffuse electricity safely through the unit's sodium-supply tanks and light fixtures.; (IV) Shut off power to that unit for about 15 minutes. If your power outlet is not nearby, this can cause block electrical lights and environmental problems.;
(II)