If the line $\frac{x - x_1}{l} = \frac{y - y_1}{m} = \frac{z - z_1}{n}$ is parallel to the plane $ax + by + cz + d = 0$,then which of the following is true?
- A$\frac{a}{l} = \frac{b}{m} = \frac{c}{n}$
- B$al + bm + cn = 0$
- C$\frac{a}{l} + \frac{b}{m} + \frac{c}{n} = 0$
- DNone of these
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