Which of the following relation is NOT a functions?

1.	Which of the following relation is NOT a functions?
A.	\[f=\{(x,x)\|x\in R\}\]
B.	\[g=\{(x,3)\|x\in R\}\]
C.	\[h=\{(n,\frac{1}{n})\|n\in I\}\]
D.	\[t=\{(n,\,\,{{n}^{2}})\|n\in N\}\]
Answer» D. \[t=\{(n,\,\,{{n}^{2}})\|n\in N\}\]

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Which of the following relation is NOT a functions?

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