Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to build a personal desktop computer [title] Prepare the mainboard (motherboard). [step] If you want to assemble the well-liked device, you should use intel i3, i5, i7 mainboard. [title] Mount the cpu in the socket of the mainboard.

Ending1: [step] If the motherboard is necessary, you may mount it on the side of the mainboard. [title] Determine if your pc will break in half (eject). Ending2: [step] You must choose the correct cpu for your motherboard, and install it according to its instructions. [title] Connect the cpu cooler to the mainboard. Ending3: [step] You should do this with the cable slots facing outward. [title] Add the adapter with cpu attach (within reason). Ending4: [title] Order the components from the mount bar at the front of the motherboard. [step] Ensure they're all in order properly, and then attach software to the motherboard.

Answer format: ending1/ending2/ending3/ending4