Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to clean a touch screen computer [title] Turn off your touchscreen computer. [step] Before cleaning your touchscreen computer, unplug and power down your device. This will reduce any electrical risks and keep your device a cooler temperature for cleaning.

Ending1: If it's dark outside, wait for a signal from a nearby power source to come up. [title] Unplug your device and make any necessary adjustments. Ending2: [title] Use a microfiber cloth to remove dust. [step] Use a microfiber cloth to clean your touchscreen thoroughly, wiping from side to side. Ending3: [title] Perform a touch screen cleaning cleaning that includes cleaning between your feet. [step] This cleaning will cause little to no bumps and scratches, similar to the process of cleaning between your toes. Ending4: [substeps] A fan or overhead fan usually works best for this job. [title] Unplug your charger and put it on a flat surface (cardboard work tray, stainless steel tray, if possible).

Answer format: ending1/ending2/ending3/ending4