Which of the following is true for a synchronous condenser?

• A. It is a synchronous motor with capacitor connected across stator terminals to improve power factor
• B. It is a synchronous motor operating at full load with leading power factor
• C. It is an over-excited synchronous motor partially supplying mechanical load, and also improving power factor of the system to which it is connected
• D. It is an over-excited synchronous motor operating at no-load with leading power factor used in large power stations for improvement of power factor