$\text { Find the value of the derivative (if it exists) of the function } f ( x ) = \frac { x ^ { 2 } } { x ^ { 2 } + 49 } \text { at the }$

Multiple Choice

$\text { Find the value of the derivative (if it exists) of the function } f ( x ) = \frac { x ^ { 2 } } { x ^ { 2 } + 49 } \text { at the }$ extremum point . (0,0)

A) $\frac { 1 } { 8 }$
B) $- \frac { 1 } { 8 }$
C) $- 1$
D) 0
E) 1