I see your point, D could also be a valid choice. EMPS and Voice Communication Server could play a role in handling SIP traffic and allocating IPCS resources.
I'm not sure, but D could also be a possibility. EMPS and Voice Communication Server might be involved in managing SIP messages and allocating IPCS(s).
This question is tricky, but I think I've got it. The Resource Manager and Session Manager are the ones that handle the SIP messages and IPCS allocation.
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