Thread safe Clarification milestone 2.2.C

[rgroom]

I had a clarification issue with the restaurant milestone 2.2.C.

The instructions say "I want you to use both methods. Say method 2 for Waiter and method 1 for all others. Remember the Customer does not have ConcurrentModificationError problems. Right?"

Does this mean that inside of WaiterAgent, we only use ConcurrentModificationError?
or do we use concurrentModificationError whenever we have a list of WaiterAgents/waiters?