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Lines vecr = veca(1) + lambda vecb and v...

Lines `vecr = veca_(1) + lambda vecb and vecr = veca_(2) + svecb_` will lie in a Plane if

A

`vecb _(1) xx vecb _(2)=0`

B

` (veca _(1) - veca_(1)) (vecb _(1) xx vecb _(2)) =0`

C

`veca _(1) xx veca _(2) =0`

D

None of these

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The correct Answer is:
B
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