Simplify the Expression by Using the Properties of Rational Exponents $\left( a ^ { 1 / 5 } a ^ { 1 / 6 } \right) ^ { 30 }$

Multiple Choice

Simplify the expression by using the properties of rational exponents. Write the final answer using positive exponents only.
$\left( a ^ { 1 / 5 } a ^ { 1 / 6 } \right) ^ { 30 }$

A) $a ^ { 11 }$
B) $a ^ { 2 }$
C) $30 a ^ { 11 / 30 }$
D) $30 a ^ { 2 }$