Q67. Let $f ( x ) = x ^ { 2 } + 9 , g ( x ) = \frac { x } { x - 9 }$ and $\mathrm { a } = f \circ g ( 10 ) , \mathrm { b } = g \circ f ( 3 )$. If e and $l$ denote the eccentricity and the length of the latus rectum of the ellipse $\frac { x ^ { 2 } } { a } + \frac { y ^ { 2 } } { b } = 1$, then $8 \mathrm { e } ^ { 2 } + l ^ { 2 }$ is equal to.\\
(1) 8\\
(2) 16\\
(3) 6\\
(4) 12