Simplify Assume That Variables in the Exponent Represent Nonzero Integers $x ^ { - 4 z } \cdot x ^ { 3 z } \cdot x ^ { 9 z + 2 }$

Multiple Choice

Simplify. Assume that variables in the exponent represent nonzero integers and that all other variables are not 0.
- $x ^ { - 4 z } \cdot x ^ { 3 z } \cdot x ^ { 9 z + 2 }$

A) $x ^ { 8 z } + 2$
B) $z x ^ { - 108 z + 2 }$
C) $x ^ { - 108 z + 2 }$
D) $z x ^ { 8 z + 2 }$