【多选题】
What two situations prevent the supervisor from silently monitoring the phone conversation of an agent in IPCC Express Enhanced?（）
A、The agent is logged in and is on the phone.
B、The agent is logged in but is not on the phone.
C、The supervisor is a participant in a phone call.
D、The supervisor is not a participant in a phone call.
E、The supervisor has barged in.
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