Which of the following is the correct sequence of step involved in...

Options

1. ANucleophilic attack, transfer of $\mathrm{H}^{-}$and transfer of $\mathrm{H}^{+}$
2. BTransfer of $\mathrm{H}^{-}$, transfer of $\mathrm{H}^{+}$and nucleophilic attack
3. CTransfer of $\mathrm{H}^{+}$, nucleophilic attack and transfer of $\mathrm{H}^{-}$
4. DElectrophilic attack by $\mathrm{OH}^{-}$, transfer of $\mathrm{H}^{+}$and transfer of $\mathrm{H}^{-}$