Refer to the exhibit. You are designing MPLS-TE for this network. The links from Perth to Sydney and from Perth to Adelaide share the same optical fiber in one given segment. Which feature should…

DiffServ-TE enables differentiated QoS bandwidth pools for traffic classes within MPLS-TE but provides no mechanism to detect or avoid shared physical resources between primary and backup paths.

Forwarding Adjacency advertises an MPLS-TE tunnel as an IGP link to enable hierarchical TE topologies but does not constrain path computation away from links sharing physical fiber.

MPLS-TE Path Protection pre-computes a standby tunnel end-to-end, but without SRLG the backup path computation has no awareness of shared fiber and may still traverse the same optical segment.

SRLG is specifically designed for scenarios where multiple logical links share a common physical medium such as optical fiber. By assigning the Perth-to-Sydney and Perth-to-Adelaide links to the same SRLG, RSVP-TE path computation will exclude any link belonging to that group when selecting a backup path, guaranteeing the backup tunnel avoids the shared fiber segment.

MPLS-TE Link Protection provides fast-reroute local repair around a failed link but does not inherently prevent the alternate segment from sharing the same physical fiber unless SRLG constraints are also applied.