What is the primary purpose of the flexible algorithm in a segment-routing environment?

to distribute designated-path information for certain traffic classes to maintain routing information in accordance with current network-performance indicators

to integrate with legacy routing protocols to ensure backward compatibility and a smooth transition in mixed network environments

to determine and assign labels for specific types of traffic, ensuring that routes maintain a valid backup path as network conditions change

to support adaptive path selection, optimizing network performance based on real-time network metrics