Which combination of the following statements is correct?
The incorporation of re-heater in a steam power plant.
P: always increases the thermal efficiency of the plant.
Q: always increases the dryness fraction of steam at condenser inlet.
R: always increases the mean temperature of heat addition
S: always increases the specific work output
(a) P and S (b) Q and S
(c) P, R and S (d) P, Q, R and S