Which of the following is a null set?...

Which of the following is a null set?

A

`{x:x in Z` and `(-1)/(2) lt x lt (9)/(2)}`

B

`{x:x in N` and `x-4le15}`

C

`{x: x in N, xlt5` and `xgt8}`

D

`{x: x in N ` and `x^2lt40}`

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The correct Answer is:

C

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