What is the systematic IUPAC name of the product formed when 4-methylhexan-3-one reacts with acidified KCN\text{KCN}KCN?

3-ethyl-3-hydroxy-4-methylhexanenitrile
2-hydroxy-2-methyl-3-ethylpentanenitrile
2-ethyl-2-hydroxy-3-methylpentanenitrile
3-hydroxy-2,3-diethylbutanenitrile