If the position vectors of the points A, B, C are î + ĵ, î - ĵ and aî + bĵ + ck̂ respectively, then the points A, B, C are collinear if

1
a = -1, b = 3, c = 0
2
a = b = c = 1
3
a = 0, b = c = 1 
4
a = 1, b = -3, c = 0

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