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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