The distance between the parallel planes $ax + by + cz + d = 0$ and $ax + by + cz + d' = 0$ is:
- A$\frac{|d - d'|}{\sqrt{a^2 + b^2 + c^2}}$
- B$\frac{|d + d'|}{\sqrt{a^2 + b^2 + c^2}}$
- C$\frac{|d|}{\sqrt{a^2 + b^2 + c^2}}$
- D$\frac{|d'|}{\sqrt{a^2 + b^2 + c^2}}$
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