Which of the following is the empty set ...

Which of the following is the empty set ?

A

1) `{x :x` is a real number and `x ^(2)-1=0}`

B

2) `{x:x` is a real number and `x ^(2) +1=0}`

C

3) `{x:x` is a real number and `x ^(2) -9=0}`

D

4) `{x:x` is a real number and `x ^(2) =x+2}`

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The correct Answer is:

B

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