At high temperature and low pressure , the Van der Waal's equation is reduced to

Question

$(a)\;[P+\large\frac{a}{V^2}][V]=RT\qquad(b)\;PV = RT\qquad(c)\;P(V-b)=RT\qquad(d)\;[P+\large\frac{a}{V^2}][V-b] = RT$