Final answer:
Fiber optic cable has the highest bandwidth of any communication medium due to its use of lasers and light signals.
Step-by-step explanation:
The correct answer is a) Fiber Optic Cable.
Fiber optic cable has the highest bandwidth of any communication medium. It uses light signals to transmit data, allowing for faster and more efficient communication compared to other mediums. The use of lasers in fiber optic communication systems enables multiple conversations to occur on a single fiber, resulting in high bandwidth.