Which one is a nucleophilic substitution...

Which one is a nucleophilic substitution reaction among the following ?

`CH_(3)CHO + HCN to CH_(3)CH(OH)CN`

`CH_(3) - CH = CH_(2) + H_(2)O overset(H^(+))to CH_(3) - undersetunderset(OH)(|)CH-CH_(3)`

`RCHO + MgX to R-undersetunderset(OH)(|)CH-R`

`CH_(3) - CH_(2) - oversetoverset(CH_(3))(|)CH-CH_(2)Br + NH_(3) to CH_(3) - CH_(2) - oversetoverset(CH_(3))(|)CH-CH_(2)NH_(2)`

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