Mathematics Three Dimensional Geometry Direction ratios and Direction cosines

Under what condition are the two lines \(\rm y=\frac{m}{l}x+a, z=\frac{n}{\ell}x+\beta\) and \(\rm y=\frac{m'}{l'}x+a', z=\frac{n'}{\ell'}x+\beta'\) Orthogonal

1
αα' + ββ' + 1 = 0
2
(α + α' (β + β') = 0
3
ℓℓ' + mm' + nn' = 1
4
ℓℓ' + mm' + nn' = 0

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