Write with Positive Exponents $x ^ { - 8 / 7 }$

Multiple Choice

Write with positive exponents.
- $x ^ { - 8 / 7 }$

A) $\frac { 1 } { x ^ { 7 / 8 } }$
B) $\frac { 1 } { x ^ { 8 / 7 } }$
C) $- x ^ { 8 / 7 }$
D) $\frac { - 1 } { x ^ { 8 / 7 } }$