ISA Brown - Roo or Hen?

[UrsaFarm]

Hey everyone!

I am raising my first flock from chicks that were purchased at Tractor Supply back in April. The enclosure advertised the breed as ISA Browns and they are all supposed to be female.
They are getting close to 3 months old and I suspect one of them in particular is a rooster.
However, I am inexperienced and not 100% sure so I would love to get a more expert opinion.

Pictures below for reference.

Thank you in advance!

 

[Rhodebar Lover]

Pullets for sure! Cockerels of this cross are white!

 

[TheOddOneOut]

ISA Browns are Sexlinks. Your answer is clear.

 

[nuthatched]

What makes you think it's a rooster? Isa browns are sexlinks, which means, males and females are different colors.

 

[UrsaFarm]

Wow thanks for all the quick feedback and that's a relief!
She seemed more white compared to the others and the tail feather seemed more 'rooster like' so I started second guessing.