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If the mirror image of the point (2, 4, 7) in the plane 3x – y + 4z = 2 is (a, b, c), the 2a + b + 2c is equal to :

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If the mirror image of the point (2, 4, 7) in the plane 3x – y + 4z = 2 is (a, b, c), the 2a + b + 2c is equal to : 

(A) 54 

(B) 50 

(C) −6 

(D) −42

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Correct option is (C) −6 

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