Which pharase best indicate the passage's main idea ?

There is no passage, so it is impossible to answer this question. I apologise.

answer: the four parts of the "australian ballot" 1. the ballot paper is printed at public expense. 2. the ballot paper lists all candidates by position, as well as any other propositions. 3. ballot papers are distributed only at the polling place. 4. ballot papers are filled out by the voter in private. (secret ballot).