How is compressibility factor expressed in terms of molar volume of the real gas and that of the ideal gas ?

This question has Statement I and Statement II. Of the four choices given after the Statements, choose the one that best describes the two Statements. Statement -I: Compressibility factor is defined as the ratio of molar volume of real gas to the molar volume of ideal gas. Statement - II: The compressibility factor (Z) at critical state is 1

For an ideal gas, compressibility factor is

The compressibility factor for an ideal gas is

The compressibility factor for an ideal gas is

The compressibility factor for an ideal gas is