Factor completely 50a2b5 – 35a4b3 + 5a3b4

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Factor completely 50a2b5 – 35a4b3 + 5a3b4

a. 10b2 – 7a2 + ab
b. a2b3(50b2 – 35a2 + 5ab)
c. 5(10a2b5 – 7a4b3 + a3b4)
d. 5a2b3(10b2 – 7a2 + ab)