What is the Outer Court composed of?

A、The Hall of Supreme Harmony, the Hall of Mental Cultivation and the Hall of Preserving Harmony.;

B、The Hall of Supreme Harmony, the Hall of Central Harmony and the Hall of the Supreme Pole.;

C、The Hall of Mental Cultivation, the Hall of the Supreme Pole and the Hall of Preserving Harmony.;

D、The Hall of Supreme Harmony, the Hall of Central Harmony and the Hall of Preserving Harmony.