The planets of the solar system are classified into two main groups. What are the names of those two groups?
A:One group is called the inner or outer planets, and the other group is called the terrestrial or gas giant planets.
B:One group is called the inner or terrestrial planets, and the other group is called the outer or giant gas planets.
C:One group is called the inner or gas giant planets, and the other group is called the outer or terrestrial planets.
D:One group is called the inner or Jovian planets, and the other group is called the outer or gas giant planets.