Simplify Assume That Variables in the Exponent Represent Nonzero Integers $\left( x ^ { - 2 a - 1 } \right) ^ { - 4 }$

Multiple Choice

Simplify. Assume that variables in the exponent represent nonzero integers and that all other variables are not 0.
- $\left( x ^ { - 2 a - 1 } \right) ^ { - 4 }$

A) $x ^ { 3 a + 3 }$
B) $\frac { 1 } { x ^ { 8 a + 4 } }$
C) $x ^ { 8 a } + 4$
D) $\frac { 1 } { x ^ { 3 a } + 3 }$