The Value Of $\lim _ { x \rightarrow \infty } \operatorname { erfc } ( x )$

Multiple Choice

The value of $\lim _ { x \rightarrow \infty } \operatorname { erfc } ( x )$ is

A) 0
B) 1
C) $\pi / 2$
D) $\sqrt { \pi / 2 }$
E) $\sqrt { \pi } / 2$