What does 'trial by jury' mean in Australian law, and for what types of cases is it common?

What does 'trial by jury' mean in Australian law, and for what types of cases is it common?

• A. In many jurisdictions, serious criminal cases are tried by a jury of peers, supervised by a judge; less serious matters may be heard by a judge alone.
• B. Juries decide only on sentencing.
• C. Trials by jury are used for all civil and criminal cases.
• D. Trials by jury are only for international crimes.

Answer: (A)