Consider the following statements
1. Flywheel and governor of an engine are the examples of an open loop control system
2. Governor is the example of closed loop control system
3. The thermostant of a refrigerator and relief valve of a boiler are the examples of closed loop control system
Which of these statements is /are correct?
(a)1 only (b) 2 and 3 (c) 3 only (d) 2only