If $A=\left[\begin{array}{lll}1 & 2 & 2 \\ 2 & 1 & 1 \\ 1 & 2 & 1\end{array}\right]$, then $\left|\operatorname{Adj}\left(A^2\right)\right|=$

• A

  $9$
• B

  $27$
• C

  $729$
• Correct answer
  D

  $81$

Hence, the correct answer is option: 'D'.