Which additional area may require trouble-shooting for a remote worker connected to a public network, over an office worker connected to the corporate private network?

Which additional area may require trouble-shooting for a remote worker connected to a public network, over an office worker connected to the corporate private network?
A . System Parameters ip-options in Communication Manager
B . System Manager SIP User Communication Profile (remote worker settings)
C . Session Border Controller configuration
D . Media Server (AAMS) Public Network settings

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Answer: C