Mnesia reads with multiple table copies

[Garrett Smith]

WIth Mnesia's location transparency, what is the scheme used to select
a source for reads when there are multiple table copies? The factors
that I imagine would be considered are:

* local vs remote
* ram vs disk
* running vs stopped nodes

E.g. one might assume that a local, ram based read would be chosen
over a remote, disk base read.

My apologies if this is well known -- I've poked around the docs and
Google, but haven't turned up anything on this.

Thanks,
Garrett