Which of these two properties alone are not sufficient to specify the

Question

Consider the following properties of vapor :                        

I . Pressure

2. Temperature

3. Dryness fraction

4. Specific volume

Which of these two properties alone are not sufficient to specify the condition of a vapour?

(a) I and 2                   (b) I and 3

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