Find the Foci of the Ellipse $$81 x ^ { 2 } + 36 y ^ { 2 } = 2916$$

Multiple Choice

Find the foci of the ellipse.
- $$81 x ^ { 2 } + 36 y ^ { 2 } = 2916$$

A) $( 0 , \pm 9 )$
B) $( 0 , \pm 6 )$
C) $( \pm 3 \sqrt { 5 } , 0 )$
D) $( 0 , \pm 3 \sqrt { 5 } )$