Which two statements describe the usage of the IS-IS overload bit technique?

If overload-bit is set on a Level 2 intermediate system, the other Level 2 intermediate systems in the topology will stop using the overloaded IS to forward Level 2 traffic. However, the intermediate system can still forward Level 1 traffic.

It can be set in intermediate systems (IS-IS routers) to prioritize control plane CSNP packets.

It can be used to automatically synchronize the link-state database between Level 1 intermediate systems.

It can be set in intermediate systems (IS-IS routers) to avoid traffic black holes until routing protocols are fully converged after a reload operation.

It can be set in intermediate systems (IS-IS routers) to attract transit traffic from other intermediate systems.