Factor the Following Polynomial Completely $3 a ^ { 4 } - 243$

Factor the following polynomial completely. $3 a ^ { 4 } - 243$

A) $3 ( a + 3 ) \left( a ^ { 2 } + 9 \right)$
B) $3 \left( a ^ { 2 } - 9 \right) \left( a ^ { 2 } + 9 \right)$
C) $3 ( a - 3 ) ( a + 3 ) \left( a ^ { 2 } + 9 \right)$
D) $( a - 3 ) ( a + 3 ) \left( a ^ { 2 } + 9 \right)$
E) none of these

Correct Answer:

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