What is the diameter of the i sphere `x^2 +y^2 +z^2 -4x+6y-8z-7=0`?

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Q 2339745612.     What is the diameter of the i sphere
`x^2 +y^2 +z^2 -4x+6y-8z-7=0`?
NDA 2012 Paper 1
A

4 units

B

5 units

C

6 units

D

12 units

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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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