What is the adversarial system? Which of the following is correct?

The adversarial system is a type of mediation system where the parties attempt to negotiate a settlement before a judge

The adversarial system is a combative or competitive type of system used between the parties to make points before a judge or jury in court

The adversarial system is simply a system where each party offers an opinion and the judge asks questions to ensure that each party has sufficiently presented its case

The adversarial system is a combative system used to solve civil disputes; it is not permitted to be used when a criminal case is heard before a judge