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If I = a^2+ b^2 + c^2 , where a and b ar...

If `I = a^2+ b^2 + c^2` , where a and b are consecutive integers and c = ab, then √I is

A

an even number and it is not a square of an integer

B

an odd number and it is not a square of an integer

C

square of an even integer

D

square of an odd integer

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