$\begin{array}{1 1} (a)\;Molecular\;interaction\;between\;atoms\;and\;\large\frac{PV}{nRT} > 1\\(b)\;Molecular\;interaction\;between\;atoms\;and\;\large\frac{PV}{nRT} < 1\\(c)\;Finite\;size\;of\;atoms\;and\;\large\frac{PV}{nRT} > 1\\(d)\;Finite\;size\;of\;atoms\;and\;\large\frac{PV}{nRT} < 1\end{array}$