So it's been a long while and I don't remember.
I know all AC blocks incoming physical damage. The + from AC blocks incoming magical damage. But what about AMF and GA, I don't remember.
For GA I see this in the wiki:
Not sure what that means though, + affects GA? I get the second part.
For AMF I couldn't find anything like this in the wiki. It mentions RoBF lowering it; which I remember, but nothing else.