A(n)is the interface used toconnect external devices to the computer.
a. drive
b. expansionhub
c. hub
d. port

D. PORT

Explanation:

A Port is the interface used to connect external devices to  computer.

Ports are of various types based on the type of communication interface:

For example:

Serial port : information transfer takes place one bit at a time.Parallel port : transfer of multiple bits at a time.Ethernet : used for connecting network cableUSB : Universal Serial Bus

Computer peripherals like mouse,keyboard, modem, printer etc connect to the computer via the port which is in accordance with their specified communication interface.

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