The two-ballot system used in presidential elections means that

a. citizens vote for the president and prime minister on separate ballots.
b. only two candidates can run for president.
c. if no candidate wins a majority on the first ballot, a run-off election is held two weeks later between the top two candidates.
d. citizens vote for the president and the National Assembly on separate ballots.
e. citizens vote for the individual on one ballot and the party on another.

c