Factor out the gcf for 21x^3y^2 - 7x^2y + 42xy

select one:
a. 7x^2y + 42xy
b. 7x^2y(3xy - 1 + 6)
c. 7xy(3x^2y - x + 6)
d. 7(3x^3y^2 - x^2y + 6xy)

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