Overall, what do current data suggest about planetary types in other planetary systems?
a. Jovian planets are common, whereas terrestrial planets are rare.
b. All planets fall into the same terrestrial and jovian categories as the planets in our solar system.
c. Planets come in a wider range of types than the planets in our solar system.
d. Planets that fall into either the terrestrial or jovian categories are extremely rare outside of our own solar system.