Use Graphical Methods to Find Any Turning Points of the Graph

Multiple Choice

Use graphical methods to find any turning points of the graph of the function.
- $$f ( x ) = \frac { 1 } { x ^ { 2 } + 1 }$$

A) $( - 1,0.5 )$
B) $( - 1,0.5 ) , ( 0,1 ) , ( 1,0.5 )$
C) $( 1,0.5 )$
D) $( 0,1 )$