Find the Exact Value of the Expression $\tan \left[ \tan ^ { - 1 } ( - 0.4 ) \right]$

Multiple Choice

Find the exact value of the expression. Do not use a calculator.
- $\tan \left[ \tan ^ { - 1 } ( - 0.4 ) \right]$

A) $- 0.6$
B) $- 0.4$
C) $- 2.3652$
D) $- 2.5$