Is gold an element or a compound?

Correct the following chemical formulae: $\mathrm{A}\mathrm{l}{\left(\mathrm{N}\mathrm{O}\right)}_3$

$\mathrm{A}: {\mathrm{Al}}_3{\left(\mathrm{NO}\right)}_3 \mathrm{B}: \mathrm{Al}{\left({\mathrm{NO}}_3\right)}_3 \mathrm{C}: {\mathrm{Al}}_2{\left({\mathrm{NO}}_3\right)}_3$ (Enter your correct answer as $\mathrm{A}, \mathrm{B} \mathrm{or} \mathrm{C}$)