Determine the Exact Value of Arctan (-1) $\frac { \pi } { 4 }$

Multiple Choice

Determine the exact value of arctan (-1) .

A) $\frac { \pi } { 4 }$
B) $- \frac { \pi } { 2 }$
C) $- \frac { \pi } { 4 }$
D) 0
E) $\frac { \pi } { 2 }$