Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to clean a sticky keyboard [title] Turn your computer off. [step] Before you begin cleaning a sticky keyboard you will need to shut down your computer. Once your computer is shut down, make sure its power sources are disconnected.

Ending1: For example, if your desktop is plugged into an outlet, you will need to unplug it. [title] Unplug the keyboard from the computer. Ending2: Turn off your computer and unplug your device. This will save energy and reduce the number of germs that can then get on your device during the cleaning process. Ending3: Be sure that the sound meter on your computer is turned off before proceeding to any important tasks. [substeps] Doing so will prevent the key from accidentally buzzing and could put a damper on the cleaning process. Ending4: Turning your computer back on will allow you to perform the cleaning. [substeps] Without power off your computer, it will take much longer to clean a sticky keyboard than if you left your computer on with the circuit breaker on.

Answer format: ending1/ending2/ending3/ending4