If a, b, c are the direction ratios of the line and l, m, n are the direction cosines of the line, then which of the following is true?

(a) \frac{l}{a}=\frac{m}{b}=\frac{n}{c}=μ

(b) \frac{l}{a}=\frac{m}{b}=\frac{n}{c}=μ-1

(c) \frac{l}{a}=\frac{m}{c}=\frac{n}{b}=μ

(d) \frac{l}{a}=\frac{n+1}{b}=\frac{n}{c}=μ

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I want to ask this question from Direction Cosines and Direction Ratios of a Line topic in division Three Dimensional Geometry of Mathematics – Class 12

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