Which of the following is a singleton set?

1.	Which of the following is a singleton set?
A.	\[\{x:\left\| x \right\|=5,x\in N\}\]
B.	\[\{x:\left\| x \right\|=6,x\in Z\}\]
C.	\[\{x:{{x}^{2}}+2x+1=0,x\in N\}\]
D.	\[\{x:{{x}^{2}}=7,x\in N\}\]
Answer» B. \[\{x:\left\| x \right\|=6,x\in Z\}\]

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Which of the following is a singleton set?

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