Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to ground yourself to avoid destroying a computer with electrostatic discharge [title] Work on a hard surface. [step] Assemble or take apart computers on a clean, hard surface to minimize static buildup. A table, countertop, or a plank of wood will work fine.

Ending1: An workbench or even a desk works well. [title] Peel the protective cover off immediately after dismantling. Ending2: [title] Stand on a hard floor in bare feet. [step] Carpets and socks can give you a charge. Ending3: Leave plenty of room for both computers and other components-you'll need five to ten inches (15 to 30 cm). Keep the cord turned off and locked at all times. Ending4: [title] Put on headphones, protect your clothes from static, or wear relatively light-colored glasses. [step] Try not to blink or move around too much when working on computers with electromagnetic discharge.

Answer format: ending1/ending2/ending3/ending4