Let $f ( x ) = \frac { \sqrt { x } - 1 } { x - 1 }$

Multiple Choice

Let $f ( x ) = \frac { \sqrt { x } - 1 } { x - 1 }$ Which of the following is true for $\lim _ { x \rightarrow 1 } f ( x )$ ?

A) $- \frac { 1 } { 2 }$
B) 0
C) 2
D) $\frac { 1 } { 2 }$
E) Does not exist