Is my Barred Rock a hen or a Roo

[Cutietothemax58]

I have 4 barred rock chickens that were purchased as pullets. Three of which are definitely hens. This morning the 4th made a noise that has alarmed me and got me thinking she may be a he. What do you think?

 

[The Happster]

Cockerel.

 

[orloffer]

Cockerel.

x2
The comb/wattles are much larger and redder than those of the others.

 

[Painted Calls]

Cockerel.

 

[HappyClucker7]

I agree, he's a boy.