Net Architecture Question

Hey again,

I now have 2 servers.
A login server where the client connects, authenticated and gets a list of playable characters.
And the main game server, where everything else happens.

My question is:

I have a need for referencing clients on the game server, like %client.Hello();
I was wondering, which of the following options is best for speed/memory/network load?

Option 1: Every function that needs a client can download it from the login server
Option 2: Every time the login server registers a new client, it tells all connected game servers about the new client, the game servers then store the client info.
Option 3: The client registers on the login server and the game server.
Option 4: Every client update is sent to the client, which sends it to all connected servers

Thanks
--James