[exim] Behaviour of randomize_hosts when some hostnames have…

If a router contains the following options:

route_list = * foo.example.com:mail.example.org
hosts_randomize

and the dig command shows one "A" IP address for foo.example.com but
two addresses for mail.example.org, is Exim

* 50% likely to use foo.example.com and 25% likely to use each of
mail.example.org's addresses,
or
* 33% likely to use each of the three?

Thanks,
Adam