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For positive l, m and n, if the points x...

For positive l, m and n, if the points `x=ny+mz, y=lz+nx, z=mx+ly` intersect in a straight line, when
Q. `cose^(-1)(l)+cos^(-1)(m)+cos^(-1)(n)` is equal to

A

`l^2+m^2+n^2=2`

B

`l^2+m^2+n^2+2mln=1`

C

`l^2+m^2+n^2=1`

D

None of these

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The correct Answer is:
(b)
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