Which of the following is heat absorbed or rejected during a polytrophic process?
(a) $\left ( \frac{\gamma -n}{\gamma-1} \right )\times$ work done
(b) $\left ( \frac{\gamma -n}{\gamma-1} \right )^{2}\times$ work done
(c) $\left ( \frac{\gamma -n}{\gamma-1} \right )^{3}\times$ work done
(d) $\left ( \frac{\gamma -n}{1-n} \right )\times$ work done