Simplify the Expression Using the Power Rule $\left( 5 ^ { 6 } \right) ^ { 5 }$

Simplify the expression using the power rule.
- $\left( 5 ^ { 6 } \right) ^ { 5 }$

A) $5 ^ { 30 }$
B) $25 ^ { 6 }$
C) $25 ^ { 30 }$
D) $5 ^ { 11 }$