Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to open a computer [title] Gather your tools. [step] Most cases will just one screwdriver to access. Some cases use thumbscrews, but a screwdriver can still help loosen an overly-tight screw.

Ending1: One exception is in case kit 1019, where you have a screwdriver with critical hardware specific to this case. [substeps] Save proper tools, such as microsoft excel or microsoft word, for later access. Ending2: [title] Turn the screw counterclockwise. [step] When right-handed, twist the screw counterclockwise with the thumb and index finger of both hands to turn the screw counterclockwise. Ending3: [substeps] The most common screw is a 6-32, which you can use a standard 2 phillips screwdriver to remove. This is the larger of the two most common sizes. Ending4: Poke your fingers into the space between the screw caps. [substeps] Remember, thumbscrews will not fully open the computer after the screwdrivers have been drilled and inserted.

Answer format: ending1/ending2/ending3/ending4