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Domain of f(x) is [-1, 2] then domain of...

Domain of f(x) is [-1, 2] then domain of `f([x] - x^2 + 4)` where [.] denotes the greatest integer function, is

A

`[-1, sqrt7]`

B

`[-sqrt3, -1] cup [sqrt3, sqrt7]`

C

`(-1, sqrt7]`

D

`[-sqrt3, -1) cup [sqrt3, sqrt7)`

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The correct Answer is:
B
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