Q 2127212181.     Suppose direction cosines of two lines are given by `ul + vm + wn = 0` and `al^2 + bm^2 + cn^2 = 0`, where `u, v, w, a, b, c` are arbitrary constants and `l, m, n` are direction cosines of the lines.
For `u = v = w =1` , both lines satisfies the relation

A

`(b+c) (n/l)^2 +2b (n/l) + (a+b) =0`

B

`(c+a) (l/m)^2 +2c (l/m) + (b+c) =0`

C

`(a+b) (m/n)^2 +2a (m/n) + (c+a) =0`

D

All of the above

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