1.C is correct. Tie trunks are used to connect PBX units together when they are at separate locations. A, B, and D are incorrect. CO trunks may connect multiple COs. PBX trunks and private trunks would exist within your organization only.
2.C is correct. A hybrid PBX will allow you to connect a digital phone as well as an IP phone, so you will need to implement this kind of PBX solution. A, B, and D are incorrect. TDM PBX systems support only analog phones. IP-only PBX systems support only VoIP phones. Trunk PBX systems do not exist, though a PBX may use a trunk for connectivity.
3.C is correct. The follow-me feature provides this functionality. The call-forwarding feature will only ring one number and would not notify you if you were in the area of the other two specified numbers. Only follow-me will ring you at all three locations.
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