Where is the optical telescope located on a radio telescope?

In the context of a radio telescope, the optical telescope is not typically a standard component. Radio telescopes are designed to detect radio waves, while optical telescopes are used for visible light. The two types of instruments serve different purposes and operate on fundamentally different principles.

Radio telescopes capture electromagnetic radiation at radio wavelengths with large dishes that collect these signals much like a satellite dish collects signals from satellites. The focus of a radio telescope system is on the receiver and signal processing of radio waves, which differentiates it from optical astronomy.

Since the optical telescope does not have a defined location on a radio telescope and its primary function does not revolve around radio wave detection, the correct answer reflects that there is no conventional integration of an optical telescope within the structure of a radio telescope. Thus, the choice indicating "none of the above" is appropriate, as it highlights the separation of the two types of telescopes, with each serving distinct observational fields in astronomy.