HCF and LCM of two polynomials are (x + 3) and (x3 - 9x2 - x + 105). If one of the two polynomials is (x2 - 4x - 21), then the other is 

1
x2 + 2x - 21
2
x2 + 2x + 15
3
x2 - 2x - 15
4
x2 - x - 15

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