Factor Completely $$x ^ { 4 } - s ^ { 4 }$$

Multiple Choice

Factor completely. If the polynomial cannot be factored, write ʺprime.ʺ
- $$x ^ { 4 } - s ^ { 4 }$$

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