To rewrite \( 812 \) using a root, you can express \( 812 \) in terms of a fractional exponent.
The correct interpretation is:
\[ 812 = 8^{\frac{1}{2}} \]
This means \( 812 \) can be written as the square root of \( 8 \).
Thus, the correct response from the options you're given would be:
\[ \sqrt{8} \] which corresponds to \( 8^{\frac{1}{2}} \).
Since no exact match is presented in the responses, the intended correct interpretation of rewriting \( 8^{12} \) as \( \sqrt{8} \) can be inferred.
If you meant to convey something else, please let me know!