Select the equivalent expression.\[\sqrt[16]{\frac{a^{-6}}{a^{2}}}\]
\( = a^{\frac{-8}{16}} \)
Step 1 :\( = \sqrt[16]{a^{-6 - 2}} \)
Step 2 :\( = \sqrt[16]{a^{-8}} \)
Step 3 :\( = a^{\frac{-8}{16}} \)