Factor the Polynomial Completely $x ^ { 4 } - 256$

Multiple Choice

Factor the polynomial completely. If the polynomial cannot be factored, write "prime."
- $x ^ { 4 } - 256$

A) $\left( x ^ { 2 } + 16 \right) ( x + 4 ) ( x - 4 )$
B) $\left( x ^ { 2 } - 16 \right) ^ { 2 }$
C) $\left( x ^ { 2 } + 16 \right) ^ { 2 }$
D) prime