The value of 16x 2 + 4y 2 + 25z 2 - 16xy + 20yz - 40zx is equal to _______. 

1
(4x + 2y - 5z)
2
(4x - 2y - 5z) 2
3
(4x + 2y + 5z) 2
4
(4x - 2y + 5z) 2

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