A service provider wishes to offer replicated archiving services to their customers. Customer data will then be replicated internally for disaster recovery. The service provider would like to have 10 customers replicate to one EMC Centera in their data center and then replicate the central EMC Centera to two separate remote facilities for disaster tolerance.
What is a valid design?

A.
Every three customer EMC Centeras replicate to one central EMC Centera in a star topology Central EMC Centera replicates to two DR sites in a chain topology

B.
Every three customer EMC Centeras replicate to one central EMC Centera in a star topology Central EMC Centera replicates to two DR sites in a star topology

C.
Ten customer EMC Centeras replicate to one central EMC Centera in a star topology Central EMC Centera replicates to two DR sites in a chain topology

D.
Ten customer EMC Centeras replicate to one central EMC Centera in a star topology Central EMC Centera replicates to two DR sites in a star topology