Mathematical Induction question bank (Maths)

If $A=\left[\begin{array}{ll}1 & 0 \\ 1 & 1\end{array}\right]$ and $I=\left[\begin{array}{ll}1 & 0 \\ 0 & 1\end{array}\right]$, then which one of the following holds for all $n \geq 1$, by the principle of mathematical indunction

$2^{3 n}-7 n-1 \text { is divisible by }$