Factor Write the Answer Without Negative Exponents $x ^ { - 1 / 3 } + x ^ { 1 / 3 }$

Multiple Choice

Factor. Write the answer without negative exponents.
- $x ^ { - 1 / 3 } + x ^ { 1 / 3 }$

A) $x ^ { 1 / 3 } \left( 1 + x ^ { 2 / 3 } \right)$
B) 1
C) $\frac { 1 + x ^ { 2 / 3 } } { x ^ { 1 / 3 } }$
D) 0