Due to the mutual synchronous rotation of Pluto and Charon, choose the statement below that best describes what an observer on Pluto would see when looking toward Charon. a. The observer would always see the same side of Charon, which would appear to hang motionlessly in the same spot in the sky all the time.
b. The observer would always see the same side of Charon, which would rise and set as it orbits Pluto.
c. The observer would see Charon rotating on its axis, but Charon would never move in the sky.
d. The observer would see different sides of Charon as it rotates on its axis and would see it rise and set as it orbits Pluto.