Mathematics Three Dimensional Geometry Angle between two lines

If (2, -1, 2) and (K, -3, -5) are the triads of direction ratios of two lines and the angle between the lines is 60° then

1
k2 - 56k - 208 = 0
2
5k2 - 110k + 112 = 0
3
7k2 - 112k - 110 = 0
4
7k2 - 112k + 110 = 0
5
Not Attempted

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