Which Spacecraft and Technique Has Given Planetary Scientists the Most

Which spacecraft and technique has given planetary scientists the most extensive information about the overall surface of Venus?

A) photography from the space shuttle at UV wavelengths that can penetrate the Venusian clouds
B) photography by the four Viking spacecraft (two landers and two orbiters)
C) photography by the Venera landers of the former Soviet Union
D) radar mapping by the Magellan orbiter

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