Find the Extrema of the Function $f ( x ) = \frac { 1 } { 11 - e ^ { - x } }$

Multiple Choice

Find the extrema of the function $f ( x ) = \frac { 1 } { 11 - e ^ { - x } }$ .

A) (0, 1)
B) $\left( 11 , e ^ { 11 } \right)$ , (0, 0)
C) $( 1,11 ) , \left( 11 , e ^ { - 11 } \right)$
D) no relative extrema
E) $\left( 11 , e ^ { - 11 } \right)$