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Which expressions are completely factored?

Select each correct answer.



A.18x^4−12x^2=6x(3x^3−2x)

B.24x^6−18x^5=6x^5(4x−3)

C.12x^5+8x^3=2x^3(6x^2+4)

D.20x^3+12x^2=4x^2(5x+3)