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For positive \( l, m \) and \( n \), if the planes \( x=n y+m z, y=l z+n x \), \( z=m z+l y \) intersect in a straight line, then
\( \mathrm{P} \)
The equation of the straight line is \( \frac{x}{a}=\frac{y}{b}=\frac{z}{c} \), where the
W
ordered traid \( (a, b, c) \) is
(a) \( \sqrt{1-l^{2}}, \sqrt{1-m^{2}}, \sqrt{1-n^{2}} \)
(b) \( l, m \) and \( n \)
(c) \( \frac{1}{\sqrt{1-l^{2}}}, \frac{m}{\sqrt{1-m^{2}}} \) and \( \frac{n}{\sqrt{1-n^{2}}} \)
(d) None of the above
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