In many corporations and professional societies, the members of the board of directors are elected by a method called approval voting. With approval voting, a voter does not cast a ranked ballot. Instead, the voter votes for as many candidates as he or she would support. If a voter does not approve of a candidate, he or she simply does not cast a vote for that candidate. The candidate(s) with the most votes wins.

The board of directors of CSC Computers is using approval voting to fill two vacancies on their executive committee. Twenty-one ballots are cast as follows for candidates A, B, C, and D.

Which two candidates will win seats on the executive committee?

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