Factor Completely $5 x^{4}-5$ A) $5\left(x^{2}+1\right)\left(x^{2}-1\right)$ B) $5\left(x^{2}+1\right)(x+1)^{2}$ C) $5\left(x^{2}+1\right)(x-1)^{2}$ D) $5\left(x^{2}+1\right)(x+1)(x-1)$

Factor completely.
- $5 x^{4}-5$

A) $5\left(x^{2}+1\right) \left(x^{2}-1\right)$
B) $5\left(x^{2}+1\right) (x+1) ^{2}$
C) $5\left(x^{2}+1\right) (x-1) ^{2}$
D) $5\left(x^{2}+1\right) (x+1) (x-1)$