The correct answer is: "Everybody who wants a job has a job"
Full employment is a wished feature in every economy. This expression describes an equilibrium scenario in the labor market, where the desires of labor suppliers and demandants perfectly match, and everybody who offers his/her labor skills in exchange for a certain wage level, is able to find an employer who offers that, and works for him/her.
Therefore, full employment ocurrs when everybody finds a job in the desired conditions.