The ratio of $\large\frac{t_{1/2}}{t_{3/4}}$ for $n^{th}$ order is

Question

$\begin{array}{1 1}(a)\;function\; of\;a_o\;alone\\(b)\;function \;of\;n\;alone\\(c)\;function\;of\;a_o\;and\;n\\(d)\;none\end{array}$