For a While, After the Space Age Began, Astronomers Did

For a while, after the space age began, astronomers did not know what the surface of Titan looks like, but today they do. Which of the following was NOT a method by which astronomers have learned about the surface of Titan?

A) using instruments on the Huygens spacecraft to take pictures as it was descending
B) using an infrared camera aboard Cassini to take images of the surface in infrared
C) using a radar instrument to penetrate the smog in Titan's atmosphere
D) using the Hubble Space Telescope in orbit to take a photo of Titan
E) taking a photograph of the surface from a spacecraft that landed on Titan