Which of the following is a fiber connector that is slightly smaller than a standard copper network cable connector?

The BNC connector is a coaxial cable connector used with older 10BASE-2 Ethernet and video equipment, not a fiber optic connector.

A GBIC (Gigabit Interface Converter) is a transceiver module that plugs into a switch or router, not a cable connector.

The MT-RJ connector is a small form-factor fiber optic connector designed to be approximately the same size as a standard copper RJ-45 plug, making it notably smaller than traditional fiber connectors like SC or ST. It supports duplex fiber in a single compact housing, which is why it is described as slightly smaller than a standard copper network cable connector.

The SC (Subscriber Connector) is a standard-sized fiber optic connector that is larger than an RJ-45, not smaller.