Comprehension \( \quad \) Let \( L \) be a straight line passing through \( (1,1,1) \) which is ...

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Comprehension \( \quad \) Let \( L \) be a straight line passing through \( (1,1,1) \) which is parallel to \( x+y+z=1 \) and intersect the line \( x+2 y+z=1, x+y+2 z=3 \).
The line \( \mathrm{L} \) is parallel to the line
(a) \( \frac{x-1}{4}=\frac{y-1}{-3}=\frac{z-1}{1} \)
(b) \( \frac{x}{4}=\frac{y}{-3}=\frac{z}{2} \)
(c) \( \frac{x}{4}=\frac{y}{-7}=\frac{z}{2} \)
(d) \( \frac{x}{4}=\frac{y}{-3}=\frac{z}{1} \)
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