Let $f ( x ) = \sec x$ For $x \in [ 0,2 \pi ]$

Multiple Choice

Let $f ( x ) = \sec x$ for $x \in [ 0,2 \pi ]$ The set of all vertical asymptotes of ƒ is

A) $\left\{ x = \frac { \pi } { 2 } \right\}$
B) $\left\{ x = \frac { 3 \pi } { 2 } \right\}$
C) $\left\{ x = - \frac { \pi } { 2 } \right\}$
D) $\left\{ x = \frac { \pi } { 2 } , x = \frac { 3 \pi } { 2 } \right\}$
E) $\left\{ x = - \frac { \pi } { 2 } , x = \frac { 3 \pi } { 2 } \right\}$