Which of the following statements regarding RSVP path messages on an Alcatel-Lucent SR is true?

RSVP messages, such as PATH and RESV, are encapsulated in IP packets. However, they must be intercepted and processed by every RSVP-capable router along the path, not just the final destination. To achieve this, the IP Router Alert Option (RAO), as defined in RFC 2113, is set in the IP header's options field. This option signals to intermediate routers that the packet's payload is of interest and should be examined by a local process (the RSVP daemon) rather than being forwarded based solely on the IP destination address.

B. The IP header source address is the ingress LER's address (e.g., system address), not a specific egress interface address.
C. The IP header destination address is the final egress LER's address for the LSP, not the address of the immediate next-hop router.
D. The RSVP HOP object is part of the RSVP payload, not the IP header. It identifies the address of the node that forwarded the message.

1. RFC 2205, "Resource ReSerVation Protocol (RSVP) -- Version 1 Functional Specification", Section 3.1.2, "Routing of RSVP messages". This RFC states that RSVP messages are sent with the IP Router Alert option to be examined by intermediate nodes.

2. Nokia 7450 ESS, 7750 SR, 7950 XRS, and VSR MPLS Guide, Release 22.10.R1, Part No: 3HE 18121 AAAC TQZZA, Section: "RSVP-TE". The guide's description of RSVP signaling implicitly relies on this standard behavior for hop-by-hop processing.