Explain why the function is discontinuous at the given number a. (Select all that apply.)
\(f ( x ) = \{ \begin{array} { l l } { \frac { x ^ { 2 } - 2 x } { x ^ { 2 } - 4 } } & { \text { if } x \neq 2 } \\ { 1 } & { \text { if } x = 2 } \end{array} a = 2\)
\(\square \lim _ { x \rightarrow 2 ^ { + } } f ( x ) \) and \(\lim _ { x \rightarrow 2 ^ { - } } f ( x ) \) are finite, but are not equal.
\(\square \lim _ { x \rightarrow 2 } f ( x ) \) does not exist.
\(\square f ( 2 ) \) is undefined.
\(\square f ( 2 ) \) is defined and \(\lim _ { x \rightarrow 2 } f ( x ) \) is finite, but they are not equal.
\(\square \) none of the above