Consider the following statements
1. A reverse jet protects Pelton turbine from over speeding
2. Runner blades of Francis turbine are adjustable
3. Draft tube is used invariably in all reaction turbine installations
4. Surge shaft is a protective device on penstock
Of these statements
(a) 1 and 2 are correct
(b) 2 and 3 are correct
(c) 3 and 4 are correct
(d) 1 and 4 are correct