Given the function $f ( x ) = \sin x + \frac { 1 } { \sin x }$, then\\
A. the minimum value of $f ( x )$ is 2\\
B. the graph of $f ( x )$ is symmetric about the $y$-axis\\
C. the graph of $f ( x )$ is symmetric about the line $x = \pi$\\
D. the graph of $f ( x )$ is symmetric about the line $x = \frac { \pi } { 2 }$