Magnesium oxide (MgO) + Water $(H_{2}O)$ = ?

Magnesium oxide (MgO) + Water $(H_{2}O)$ = ?
1). [Mg(OH)]
2). $[Mg_{2}(OH)]$
3). $[Mg(O_{2}H)_{2}]$
4). $ [Mg(OH)_{2}]$

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