A) \[:\,N=N=\underset{.\,.}{\overset{.\,.}{\mathop{O}}}\,\]
B) \[:\,N\equiv {{N}^{+}}-\underset{.\,.}{\overset{.\,.}{\mathop{O}}}\,{{:}^{-}}\]
C) \[\underset{.\,.}{\overset{.\,.}{\mathop{N}}}\,=\overset{.\,.}{\mathop{N}}\,=\underset{.\,.}{\overset{.\,.}{\mathop{O}}}\,\]
D) \[:\,N=N=\underset{.\,.}{\overset{.\,.}{\mathop{O}}}\,:\]
Correct Answer: B
Solution :
\[:N\equiv {{N}^{+}}-\overset{..}{\mathop{\underset{..}{\mathop{O}}\,}}\,{{:}^{-}}\] or \[N\equiv N\to O.\]
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