The Cartesian equation of the line which passes through the points $(3,1,2)$ and $(-1,2,1)$ is
- A$\frac{x-3}{-4}=\frac{y-1}{1}=\frac{z-2}{1}$
- B$\frac{x-3}{-4}=\frac{y-1}{1}=\frac{z-2}{-1}$
- C$\frac{x-3}{-4}=\frac{y-1}{-1}=\frac{z-2}{-1}$
- D$\frac{x-3}{-4}=\frac{y-1}{-1}=\frac{z-2}{1}$
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