b
\(\overset{\,\,\,\,\,\centerdot \,\,\centerdot }{\mathop{\underset{\,\,\,\,\centerdot \,\,\centerdot }{\mathop{:F}}\,}}\,-\overset{\centerdot \,\centerdot }{\mathop{\underset{\centerdot \,\centerdot }{\mathop{O}}\,}}\,-\overset{\centerdot \,\,\centerdot }{\mathop{\underset{\centerdot \,\,\centerdot }{\mathop{F:}}\,}}\,\) બંધકારક જોડ \(= 2\)
અબંધકારક જોડ \(= 3 + 2 + 3 = 8\)