Reduce each of the following equations to the normal form and thus determine the direction cosines and the length of the normal. A. 2x - 2y + z - 12 = 0 B. 9x + 6y - 2z + 7 = 0 C. x - 4y + 8z - 27 = 0 Answer it all.

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A: In the given question, the volume using a cylindrical shell is applied.  

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A: Option D is correct answer