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Factorize: x^2 - 4xy + 4y^2 - z^2 - 6z - 9

A(x-2y+z+3)(x-2y-z-3)

B(x-2y+z-3)(x-2y-z+3)

C(x+2y+z+3)(x-2y-z-3)

D(x-2y)^2 - (z+3)^2