An optical communications system is comprised of which components?

The correct answer highlights the fundamental components of an optical communications system. It includes a transmitter, which is responsible for converting electrical signals into optical signals for transmission. The cable, or optical fiber, serves as the transmission medium, allowing these optical signals to travel from the transmitter to the receiver with minimal signal loss and interference. Finally, the receiver is essential for converting the received optical signals back into electrical signals that can be utilized by devices or systems.

The inclusion of a logic analyzer or protocol analyzer in the other options lacks relevance to the basic structure of an optical communication system. While these tools are useful for analyzing and troubleshooting data for various types of communications, they do not form the core components necessary for the system's operation.