Use the Properties of Exponents to Simplify the Expression $\frac { x ^ { 1 / 3 } \cdot x ^ { 1 / 4 } } { x ^ { - 1 / 7 } }$

Multiple Choice

Use the properties of exponents to simplify the expression. Write with positive exponents.
- $\frac { x ^ { 1 / 3 } \cdot x ^ { 1 / 4 } } { x ^ { - 1 / 7 } }$

A) $x ^ { 37 / 84 }$
B) $x ^ { 61 / 84 }$
C) $\frac { 1 } { x ^ { 61 / 84 } }$
D) $\frac { 1 } { \mathrm { x } ^ { 37 / 84 } }$