The odd natural number \( a \), such that the area of the region bounded by \( y=1 \), \( y=3 \), \( x=0 \), \( x=y^{a} \) is \( \dfrac{364}{3} \), is equal to:
\( 3 \)
\( 5 \)
\( 7 \)
\( 9 \)