________ cables are made of glass.

A) Coaxial
B) Fiber-optic
C) Microwave
D) Twisted-pair

Fiber-Optic

Technology that uses glass or plastic fibers to transmit data at high speeds using light.

Glass

A hard, brittle substance, typically transparent or translucent, made by fusing sand with soda, lime, and sometimes other ingredients and cooling rapidly.

Coaxial

A type of electrical cable that has an inner conductor surrounded by a tubular insulating layer, surrounded by a tubular conducting shield, often used for transmitting television signals and internet connections.