Concept:The second ballot system ensures the winner has more than half of all valid votes cast.Explanation:In this system, if no candidate secures an absolute majority in the first round, a fresh election is held.Only the top contenders from the first ballot take part in this second ballot.The candidate who then obtains an absolute majority is declared the winner.An absolute majority means receiving more than half of the total valid votes, not just the highest number.Answer:A. absolute majority