A) \[0<c<1\]
B) \[c>2\]
C) \[c>0\]
D) \[c=\pm \sqrt{3}\]
Correct Answer: D
Solution :
[d] Since d. c. of line are \[\left\{ \frac{1}{c},\frac{1}{c},\frac{1}{c} \right\}\] \[\therefore \frac{1}{{{c}^{2}}}+\frac{1}{{{c}^{2}}}+\frac{1}{{{c}^{2}}}=1\Rightarrow {{c}^{2}}=3\Rightarrow c=\pm \sqrt{3}\]
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