The Surface Features and Topology of Venus Have Been Determined

Multiple Choice

The surface features and topology of Venus have been determined primarily by

A) radar methods from Earth and from Venus-orbiting spacecraft detecting reflected radio and microwaves from the surface.
B) surface-lander vehicles that have explored the surface.
C) visible light and UV photography from the Hubble Space Telescope and Earth-bound telescopes.
D) balloon-borne spacecraft launched into the Venus atmosphere by spacecraft.