Which of the following is not an example of Guided transmission media?

Guided transmission media use physical pathways to transmit signals. Let's analyze each option:

A. Fiber optic: Uses light to transmit data through glass or plastic fibers. Signals are confined within the medium, making it a guided transmission medium.

B. Infrared wave: Transmits data through air using electromagnetic waves without a physical medium. This is an unguided transmission method.

C. Twisted pair: Uses copper wires twisted together to reduce interference. Signals travel along the wires, making it a guided transmission medium.

D. Coaxial cable: Has a central conductor surrounded by insulation and shielding, guiding signals along a physical path. This is a guided transmission medium.