"3." There is a picture about 2/3 of the way through the article that shows the iterations she's went through and some of the changes for color-deficient people.
Edit: I see you saw what I see. Without being colorblind myself, I'm not sure... but I would think the different textures (Solid vs striped) should stand out. I can only assume that she's received valid feedback on "Red with white background" vs "Red with red background" in choosing what she chose.
http://pix-media.s3.amazonaws.com/blog/883/process.png
Edit: I see you saw what I see. Without being colorblind myself, I'm not sure... but I would think the different textures (Solid vs striped) should stand out. I can only assume that she's received valid feedback on "Red with white background" vs "Red with red background" in choosing what she chose.