Which plug to use?

[Kaiso]

Ok, started my build. I'm using a Corsair SFX 450 and ROG STRIX B350-I I just want to be sure I'm plugging power correctly. In my last build (2012) the instructions and labeling were clearer to me.

 

[tinyitx]

According to the labeling, any one of the 3 would be OK.
Use #3 then.