Which of the following best compares the presidential and parliamentary systems of government?
a. A parliamentary system has an executive elected by the people, whereas a presidential system has an executive prime minister elected by legislative members.
b. A parliamentary system and presidential system both have distinct separation of powers between branches of government.
c. A parliamentary system has an impeachment process to remove the executive, whereas a presidential system removes an executive based on deficient laws.
d. A parliamentary system is volatile and laws are easily reversed, whereas a presidential system is stable and has separation of powers.