Let $f ( x ) = \frac { \sqrt { 4 - x } - 2 } { x ^ { 2 } + x }$

Multiple Choice

Let $f ( x ) = \frac { \sqrt { 4 - x } - 2 } { x ^ { 2 } + x }$ Which of the following is true?

A) . $f$ is defined at -1
B) $f$ is defined at 0.
C) $f$ has a removable discontinuity at -1.
D) $f$ has a removable discontinuity at 0.
E) $f$ is continuous at 0.