What are the "bound IP addresses" used for in LDP？（）

• A、For each such address and mask /32, one label binding is created.
• B、As the TCP endpoint, IP addresses are used by the LDP session.
• C、These addresses are used to find the label binding to put in the LFIB, by looking up these IP addresses in the routing table.
• D、These addresses are used for penultimate hop popping (PHP) when forwarding packets to the next router directly.