The equation of the straight line passing through the point $(a, b, c)$ and parallel to the $z$-axis is:
- A$\frac{x - a}{1} = \frac{y - b}{1} = \frac{z - c}{0}$
- B$\frac{x - a}{0} = \frac{y - b}{1} = \frac{z - c}{1}$
- C$\frac{x - a}{1} = \frac{y - b}{0} = \frac{z - c}{0}$
- D$\frac{x - a}{0} = \frac{y - b}{0} = \frac{z - c}{1}$
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