A) \[{{\sin }^{-1}}\left( \frac{1}{\sqrt{{{a}^{2}}+{{b}^{2}}+{{c}^{2}}}} \right)\]
B) \[{{45}^{o}}\]
C) \[{{60}^{o}}\]
D) \[{{90}^{o}}\]
Correct Answer: D
Solution :
Obviously the line perpendicular to the plane because \[\frac{a}{a}=\frac{b}{b}=\frac{c}{c}\,\,i.e.\], their direction ratios are proportional.
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