Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to open a mac mini [title] Shut down and unplug the mac mini. [step] Before attempting to make any changes to the computer, make sure you shut it off and remove the power cord from the back. Unplug any other external cables from the computer as well.

Ending1: Removing the cables will allow you to close your mac mini. [title] Connect one hand to the power cord. Ending2: [title] Transfer the computer's hard drive to another usb drive. [step] After you've physically connected your mac to the usb drive, you'll need to restore it to its original state, so make sure to do so while you're transferring the computer. Ending3: Now that it is disconnected, it will be very difficult to open your mac mini. [title] Press the key key while making sure it is turned off. Ending4: When you are ready to begin working, touch a piece of metal to discharge any static electricity from your body. [title] Place the mac mini face-down on a clean cloth.

Answer format: ending1/ending2/ending3/ending4