Easy# True for $f(x) = \tan {2x}$

APCALC-ULEDBI

Which of the following statements is true for $f(x) = \tan {2x}$?

I.$\mathop {\lim }\limits_{x \to \frac{\pi }{4}} f(x)$ does not exist.II.$\mathop {\lim }\limits_{x \to {{\frac{\pi }{4}}^ + }} f(x) = \infty $III.$\mathop {\lim }\limits_{x \to {{\frac{\pi }{4}}^ - }} f(x)\, = \infty $