Which of the following can be used to connect several devices to the system unit and are widely used to connect keyboards, mice, printers, storage devices, and a variety of specialty devices?
a. usb port
b. sata
c. parallel port
d. firewire bus

A) USB port

Explanation:

USB refers to the Universal Serial Port which was released in the year  1996. It provides established specification  for cables and connectors between computers and external devices, It also provides the protocol  for communication and power supply between the computers and peripheral devices thereby providing a plug-and-play port for external devices such as mice, keyboards, scanners, cameras, flash drives and printers etc.

the omega button is one of them.

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