Consider the following statements:
1. Gas cooled thermal rectors used CO2 or helium as coolant and require no separate moderator
2. Fast reactors used heavy water as moderator and coolant.
3. Liquid metal fast breeder reactors use molten sodium as coolant.
4. In Candu type reactors heavy water is ysed as moderator.
Which of these statements are correct?
(a) 1 and 3 (B)2 and 4
(c) 3 and 4 (d) 1 and 2