Consider the following statements
1. A gas with a compressibility factor more than 1 is more compressible than a perfect gas.
2. The x and y axes of the compressibility chart are compressibility factor on yaxis and reduced pressure on x-axis.
3. The first and second derivatives of the pressure with respect to volume at critical points are zero.
Which of the statements given above is/are correct?
a. 2 and 3 only b. 1 and 3 only
c. 1 and 2 only d. 1, 2 and 3