Factor the expression completely.5x4 - 80

A. (5x2 + 4)(x - 2)(x + 2)
B. 5(x2 + 4)(x2 + 4)
C. 5(x2 + 4)(x - 2)(x - 2) 
D. 5(x2 + 4)(x - 2)(x + 2) 

Answer: D

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