Which One of the Following Statements Is True with Regard

Which one of the following statements is true with regard to what candidates need to know when campaigning for office?

A) Candidates must know the mix of characteristics, preferences, and attitudes held by their supporters and then micro target those who share that political DNA.
B) Candidates must know the voters, divisions or groups that exist among them, and how a majority might be created from them.
C) Candidates need to know what likely voters think both of its candidate and of the major issues of the day so that the two can be related to maximum advantage.
D) All of the above