Which fact must a network engineer consider when planning to deploy RSVP-TE FRR?

This is the opposite of the correct behavior; NNHOP offers more comprehensive protection against both link and node failures.

RSVP-TE Fast Reroute is a feature specifically designed for RSVP-TE Label Switched Paths and does not provide FRR protection for MPLS LDP LSPs, which rely on IGP convergence for rerouting.

FRR backup tunnels reserve bandwidth sufficient to carry the traffic of the specific primary tunnel they are designed to protect, not the aggregate bandwidth of all potentially protected tunnels simultaneously.

A PLR (Point of Local Repair) prefers NNHOP (Next-Next-Hop) backup tunnels over NHOP (Next-Hop) tunnels because NNHOP protection provides node protection, which covers both link and node failures, offering a more robust level of fault tolerance compared to link-only NHOP protection.