In game theory, the nash equilibrium is defined as:

Explanation:

Nash equilibrium is game theory that says the optimal outcome of a game is achieved when there is no deviation from the initial strategy.

It occurs when a player do not change his/her own chosen strategy after considering his opponent to get the best outcome.

A player strategy during game is believed to be optimal and should not be changed for the opponent irrespective of the person strategy. If eventually a strategy is changed, it may not attract any compensation.

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).