Observe the graph.
The function is a root function.
The rate of change of the function is decreasing.
Hence derivative of the function is a rational function.
Graph (a) is the correct choice.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7638897a5bb9204998d7996637c7b50a.png\")
is a root function.![\"\"](\"/userfiles/image/steps_images/solution.JPG\")