The graph of the derivative function $f ^ { \prime }$ of a function f defined on the set of real numbers is given below.
Accordingly, regarding the function f:\\
I. It is decreasing.\\
II. $f ( a )$ is a local maximum value.\\
III. $f ^ { \prime \prime } ( a )$ is not defined.
Which of the following statements are true?\\
A) Only I\\
B) Only II\\
C) I and III\\
D) II and III\\
E) I, II and III