Which of these statements are correct?

Question

Consider the following statements :

When dry saturated steam is throttled from a higher pressure to a lower pressure, the

1. Pressure decreases and the volume increases.
2. Temperature decreases and the steam becomes superheated.
3. Temperature and the dryness fraction increase.
4. Entropy increases without any change in enthalpy.

Which of these statements are correct?

(a) 1 and 4                   (b) 1,2 and 4

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