Which expression is equivalent to $x^4-64$ ?
A$(x+4)^2(x-4)^2$
B$\left(x^2+8\right)\left(x^2-8\right)$
C$\left(x^2+8\right)(x+2)(x-2)$
D$\left(x^2+8\right)(x+4)(x-4)$
A$(x+4)^2(x-4)^2$
B$\left(x^2+8\right)\left(x^2-8\right)$
C$\left(x^2+8\right)(x+2)(x-2)$
D$\left(x^2+8\right)(x+4)(x-4)$