According to the professor, what is the significance of having a satellite in orbit about 36.000 kilometers above Earth's surface? A. This is the physical limit of the length that a carbon nanotube cable could reach. B. A satellite orbiting at this height can remain directly above one location on Earth. C. Earth's gravitational field is too weak to hold a satellite in orbit at higher altitudes. D. The distance around Earth's equator is approximately 36,000 kilometers.