Evaluate the Improper Integral or State That It Is Divergent $$\int _ { - \infty } ^ { \infty } x ^ { 3 } e ^ { - x ^ { 4 } } d x$$

Multiple Choice

Evaluate the improper integral or state that it is divergent.
- $$\int _ { - \infty } ^ { \infty } x ^ { 3 } e ^ { - x ^ { 4 } } d x$$

A) $- \frac { 1 } { 2 }$
B) 0
C) $\frac { 1 } { 4 }$
D) Divergent