If product of distance of point (1,2,-1)...

If product of distance of point `(1,2,-1)` from planes 2x-`3y+z+k=0` and
`x+2y+3z=0` is `1`, then `k` is equal to

A

(a) `12`

B

(b) `14`

C

(c) `10`

D

(d) `8`

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The correct Answer is:

A

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