Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to test an ethernet cable [title] Purchase an ethernet cable tester. [step] There are many models you can purchase. Make sure it has a battery in it and power it on.

Ending1: [substeps] A battery adapter is an adapter that connects a device to the ethernet cable. Most cable testers will have charging ports or fittings that will allow you to measure voltage. Ending2: This will check the battery to make sure the network cable is not defective. Attach the preset wire to the ethernet cable. Ending3: [substeps] It should not read the voltage that each cable has. In the modern sense, the battery is not fully charged, but it should read a voltage somewhere between 120 and 140 volts. Ending4: [title] Plug one end of the cable into the transmit jack. [step] The transmit jack on the tester maybe be labeled " tx ".

Answer format: ending1/ending2/ending3/ending4