单选题

To increase the availability of an Advanced Replication environment, you can add a new master to a replication group without quiescing the group. This is achieved().

AOnly when the new master site already has existing replication groups. 

BBy issuing a single command to create, populate, and activate the new master. 

CWhen the master definition site is not the same for all of the master groups. 

DWithout impacting end users who are executing data manipulation language (DML) commands on the replicated tables.

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