Which three statements are true about a Cluster-ID? (Choose three)

Which three statements are true about a Cluster-ID? (Choose three)

A.
A Cluster-ID configuration is only required on the route reflectors.

B.
The Cluster-ID is the router ID of the originator of a route within the local AS.

C.
Cluster-List is used to track Cluster IDs similar to the way that the AS-PATH is used to track AS numbers.

D.
When a cluster contains multiple route reflectors, all the route reflectors in the cluster need to be configured with the same Cluster-ID.