Thermal efficiency of the simple Steam or Rankine cycle can be improved increasing the

Question

Consider the following statements.

1.    Thermal efficiency of the simple Steam or Rankine cycle can be improved increasing the maximum system pressure and temperature

2.    Increasing the superheat of the steam improves the specific work a decreases the moisture content exhaust steam

3.    Increasing maximum system pressure always increases the moisture content at the turbine exhaust

4.    Lowering the minimum system pressure increases the specific work of the cycle

Which of the above statements are correct?                                           

1. 1, 2 and 3                (b) 1, 2 and 4

(c)   2, 3 and 4             (d) 1, 3 and 4