Which of the Following Functions Is Represented by the Graph $y = \tan \frac { x } { 3 }$

Which of the following functions is represented by the graph below?

A) $y = \tan \frac { x } { 3 }$
B) $y = - 3 \csc \frac { \pi x } { 2 }$
C) $y = \frac { 1 } { 3 } \cot \frac { \pi x } { 2 }$
D) $y = \sec 2 x$
E) $y = \tan ( x + \pi )$

Correct Answer:

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