Raise the Monomial to the Indicated Power $$\left( - 3 a ^ { 7 } b ^ { 4 } \right) ^ { 3 }$$

Multiple Choice

Raise the monomial to the indicated power. Use the properties of exponents to help with the manipulation. $$\left( - 3 a ^ { 7 } b ^ { 4 } \right) ^ { 3 }$$

A) $- 27 a ^ { 7 } b ^ { 12 }$
B) $27 a ^ { 21 } b ^ { 12 }$
C) $- 27 a ^ { 21 } b ^ { 12 }$
D) $- 27 a ^ { 10 } b ^ { 7 }$
E) $- 27 a ^ { 21 } b ^ { 4 }$