Refer to the exhibit. An engineer must update the configuration of the network with these requirements: - PE routers must define labels for IS-IS learned routes in AS100. - P routers must not…

While identical to option C in command, option C is designated as the correct answer, implying a specific context or ordering not provided.

CE1 is a customer-edge router, not involved in core MPLS label distribution for provider or external routes.

Applying `mpls ldp label` on PE2 enables the router to generate and distribute MPLS labels for its IS-IS learned routes within AS100, fulfilling the first requirement. The second requirement regarding P routers not receiving external IPv6 LDP bindings is typically handled by default LDP filtering or specific policies not detailed here, which ensure only relevant labels are propagated.

PE1 is another PE router; however, the question's correct answer specifically points to PE2, suggesting PE2 plays a particular role in the (missing) exhibit related to AS100's IS-IS learned routes.