What is the purpose of the duster-list attribute within a BGP route reflector group?

What is the purpose of the duster-list attribute within a BGP route reflector group?
A . to disable internal cluster re-advertisements
B . to define the router that first advertised the route to the route reflector
C . to override the router 10 value within the cluster
D . to facilitate loop detection within the route reflector network

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Answer: D