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# The IUPAC name of

$(a)\;5-Oxo-4-hydroxy-2-pentanone \\(b)\;4-Hydroxy-5-al-2-Pentanone \\(c)\;2-Hydroxy-4-Oxopentanal \\(d)\;1-Al-4-Oxo-2-Pentanol$

$\therefore$ Aldhyde behaves as a functional group and numbering starts from terminal functional group.
$2-Hydroxy-4-Oxopentanal$ is correct