Place region and Route region of Quartus Partial Reconfiguration

Thanks to the reply. 1) and 3) are resolved.

2) Yes, I understand what the option says. But let's say that we create the exact same size of Route region as Place region(fixed with expansion = 0). Then, if "Reserved Placement" setting is on, it prevents the outside logic from being placed in the Place region, and because Place region is the same as Route region, it prevents the outside logic from being placed in the Route region too. This is why I assume that if they are equal-sized, "Reserved Routing" is inferred from "Reserved Placement."

However, in the experiment that I have the same Place region and Route region, "Reserved Routing" seems to do something different. Based on the option description, it should do the exact same thing as "Reserved Placement" in this case. My guess is that it might do something similar to my question on 3)... For instance, "Reserved Routing" may be the option to prevent static routing to use routing resources in the PR region?