Concept:
Geostationary satellites orbit the Earth at an altitude of approximately \(35,786\) km (about \(36,000\) km) above the equator.
They revolve with the same angular velocity as the Earth and appear stationary relative to the Earth's surface.
Step 1: Recall the orbit characteristics.
Geostationary satellites are mainly used for
• Weather monitoring
• Communication
• Television broadcasting
Step 2: Identify the correct satellite.
Hence,
\[
\boxed{\text{Geostationary satellites operate at about }36000\ \text{km}.}
\]
Therefore, the correct option is
\[
\boxed{(D).}
\]