What is the equation of the sphere with unit radius having centre at the origin?

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Q 2349212113.     What is the equation of the sphere with unit
radius having centre at the origin?
NDA 2013 Paper 1
A

`x^2 + y^2 + z^2 = 0`

B

`x^2 + y^2 + z^2 = 1`

C

`x^2 + y^2 + z^2 = 2`

D

`x^2 + y^2 + z^2 = 3`

HINT


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

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