Which implementation uses both the legacy system and new system until all users verify that the new system functions correctly?

Quick pl which one of the following is considered a peripheral? a software b mouse c usb connector d motherboard

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Ihave a singular monitor that is a tv for my computer. recently, i took apart my computer and put it back together. when i put in the hdmi cord and booted the computer to see if it worked, the computer turned on fine but the screen was blue with "hdmi no signal." i've tried everything that doesn't require buying spare parts, any answer is appreciated!