Forewarding address after move-out: last roommate or all?

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Here is a very detailed San Francisco rental question.

I rented to a group of 3 roommates. The last one is moving out, but the deposit belongs to all of them. Do I ask only the last one to give his forwarding address or do I need to contact all of them? 

If I ask only the one who is departing, the other two will be pissed off. If I ask all of them, I have to wait for them to get their act together and agree.

The deposit refund check will be issued to "Tenant A, Tenant B and Tenant C" regardless of where it is sent.