Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to determine ram type [title] Prepare your computer to remove a memory stick. [step] Power down your computer and turn off the power switch located on the back of your computer case, near the power cord socket. [substeps] Remove the case door and locate the memory slots on the motherboard.

Ending1: The slots, which are approximately 4.5 to 5 inches (10 to 12 cm) long, typically will be lined up in a row of 4 to 8. Depending on amount of ram installed on your system and the number of memory slots on your motherboard, some of the slots may be empty. Ending2: In case one had to be replaced, use a phillips-head screwdriver to turn the screws counterclockwise. Place the old memory stick in the slot behind the ram slot. Ending3: Hit the key on your mouse to place the index card into the slot for ram. [title] Insert the memory stick into the slot. Ending4: The slots for the ram stick are located on the back of your computer case, or within the case itself. Find the gnu motherboard connector located in the back of your computer.

Answer format: ending1/ending2/ending3/ending4