Simplify Write the Answer in Exponential Form Without Negative Exponents $\left( x ^ { - 1 / 2 } \right) ^ { - 1 / 6 }$

Multiple Choice

Simplify. Write the answer in exponential form without negative exponents.
- $\left( x ^ { - 1 / 2 } \right) ^ { - 1 / 6 }$

A) $x ^ { 12 }$
B) $\frac { 1 } { x ^ { 12 } }$
C) $x ^ { 1 / 12 }$
D) $\frac { 1 } { \mathrm { x } ^ { 1 / 12 } }$