Which statement is correct about policy-based routing?

PBR overrides the routing table and forwards packets based on match criteria; during network reconvergence, PBR policies on different routers may not align with updated routing table entries, causing packets to loop between routers that each believe the other is the correct next hop until full convergence is reached.

PBR is a unidirectional feature applied on ingress interfaces to redirect traffic before a routing table lookup, and it does not need to be symmetrically configured at both ends of a GRE tunnel to operate correctly.

PBR adds per-packet processing overhead on the router where it is applied but does not inherently impose a scalability ceiling on the overall network design.

PBR has no role in failure detection - it only redirects matching traffic to a specified next hop and does not interact with link failure timers or neighbor detection mechanisms.