How Do Independent Regulatory Commissions or Boards Differ from Other

How do independent regulatory commissions or boards differ from other executive departments?

A) They are small policy-making bodies.
B) They exist independently of the rest of the executive branch.
C) Their membership is bipartisan.
D) They can be removed only on the basis of poor or corrupt behavior.
E) All of the above statements about independent regulatory commissions or boards are true.