A) \[l=m=n=\frac{1}{\sqrt{3}}\]
B) \[l=m=n=\pm \frac{1}{\sqrt{3}}\]
C) \[l=m=n=-\frac{1}{\sqrt{3}}\]
D) \[l=m=n=\pm \frac{1}{\sqrt{2}}\]
Correct Answer: B
Solution :
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