Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to clean a biometric scanner [title] Disconnect the unit from the power source [title] Keep a soft cloth handy when you are about to start cleaning the scanning area. [title] Take care while lifting up and removing the front layer of the scanning area. [title] Remove the part where the finger is placed for scanning.

Ending1: [title] Oil the area with a residue remover. [step] Splash water on the cloth until the oil is wiped off. Ending2: [title] Properly remove with a soft cloth, doing not touch the area it was placed for. [title] Allow it to dry before touching the ground. Ending3: [step] Take care carefully as the broken finger will be located near to the area where the magnets attach. Then, carefully remove the tip the rest of the scanning area. Ending4: [title] Clean the area using a soft piece of cloth. [title] If there are bigger dirt particles, try removing them using a light blower.

Answer format: ending1/ending2/ending3/ending4