Simplify the Exponential Expression $\frac { x ^ { 5 / 3 } \cdot x ^ { - 5 / 6 } } { x ^ { - 1 / 2 } }$

Multiple Choice

Simplify the exponential expression. Write any negative exponents as positive exponents. Assume all variables represent positive real numbers.
- $\frac { x ^ { 5 / 3 } \cdot x ^ { - 5 / 6 } } { x ^ { - 1 / 2 } }$

A) $\frac { 1 } { x ^ { 4 / 3 } }$
B) $\frac { 1 } { \mathrm { x } ^ { 1 / 3 } }$
C) $x ^ { 4 / 3 }$
D) $x ^ { 1 / 3 }$