Vander Waal's equation for 1 mole of a real gas under given conditions :
(a) high pressure
(i) $PV = RT + Pb$
(b) low pressure
(ii) $P V=R T-a / V$
(c) force of attraction between gas molecules is
(iii) $P V=R T+a N$ negligible
(d) volume of gas molecules is negligible
(iv) $\left[P+\left(a / N^{2}\right)\right](V-b)=R T$.
(A) (a)-(i), (b)-(ii), (c)-(i), (d)-(ii)
(B) (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
(C) (a)-(iv), (b)-(iii), (C)-(ii), (d)-(i)
(D) (a)-(iv), (b)-(ii), (c)-(iii). (d)-(i).