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The maximum possible domain and thecorre...

The maximum possible domain and thecorresponding range of `f(x)=(-1)^x`

A

`D=R,E=[-1,1]`

B

D=I( the set of integers ), E=[-1,1]

C

D=R,E=[-1,1]

D

`D=I,E={{:(+1, " when " x=0 or even ),(-1," when x is odd "):}`

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The correct Answer is:
D
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