Which of the following statements are true? 1. Bell housing connects motor and pump 2. Centrifugal pump is a non-positive displacement pump 3. Centrifugal pumps allow the back flow of fluid from delivery side to the suction side of the pump 4. The function of vent plug used in a reservoir is to flush out oil

• A. 1, 2 and 4
• B. 2, 3 and 4
• C. 2 and 3
• D. all of the above