In a multi-node centralized network, there is a central node with a U1981 deployed, and two branch nodes, one with a U1911 and the other with a U1960. When SIP user A under U1911 calls POTS user B under U1960, the path along which the call’s SIP signaling is transmitted is ().

In a multi-node centralized network, there is a central node with a U1981 deployed, and two branch nodes, one with a U1911 and the other with a U1960. When SIP user A under U1911 calls POTS user B under U1960, the path along which the call’s SIP signaling is transmitted is ().
A . U1911->U1981->U1960
B . U1911->U1960
C . A->U1981->U1960
D . U1911->U1981->B
E . U1911->U1981->B

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Answer: C