Which of the following statements about real gases are correct?

At high enough pressure the excluded volume always dominates, so $Z$ exceeds 1 (A true). The law of corresponding states says $Z$ is approximately a universal function of $T_r$ and $P_r$ (B true). $Z$ greater than 1 reflects the current state, not the ability to liquefy on cooling; e.g. nitrogen at $200\mathrm{atm}$ has $Z$ above 1 but liquefies when cooled (C false). The virial form $Z=1+B^{\prime }P$ gives a linear deviation at low $P$ (D true).