Find the Exact Solution of the Equation $- 4 \tan ^ { - 1 } x = \pi$

Multiple Choice

Find the exact solution of the equation.
- $- 4 \tan ^ { - 1 } x = \pi$

A) $x = 0$
B) $x = \frac { \pi } { 4 }$
C) $x = - 1$
D) $x = 1$