What are the two considerations for designing ECS replication groups in an archive solution? (Select 2)

What are the two considerations for designing ECS replication groups in an archive solution? (Select 2)
A . Fast ingest on EXF900 may speed up the replication process and reduce RPO.
B . WAN latency may create performance bottlenecks during remote reads.
C . Global replication groups are mandatory in a two or more ECS VDC setup.
D . Limit the number of replication groups to reduce indexing overhead.

Answer: BD