Select the correct answer.
Which expression is equivalent to this polynomial? $x^2+8$
A$(x+2 \sqrt{2}) \cdot(x-2 \sqrt{2})$
B$(x+4 i )(x-4 i )$
C$(x+2 \sqrt{2})^2$
D$(x+2 \sqrt{2} i )(x-2 \sqrt{2} i )$
Which expression is equivalent to this polynomial? $x^2+8$
A$(x+2 \sqrt{2}) \cdot(x-2 \sqrt{2})$
B$(x+4 i )(x-4 i )$
C$(x+2 \sqrt{2})^2$
D$(x+2 \sqrt{2} i )(x-2 \sqrt{2} i )$