Look like 4 pullets, purely based on the lack of male barring. A cockerel would be showing wider white bars, where these 4 are all showing consistent coloring lacking the double barring. Also, at 9 weeks, a cockerel would be showing prominent wattles too and possibly roo feathering.
Lack of all the roo markers, I would say you have 4 lovely pullets
Lack of all the roo markers, I would say you have 4 lovely pullets