Which of the following is not a requirement for creating an online secondary for SQL Database?
A. The secondary database must have the same name as the primary.
B. They must be on separate servers.
C. They both must be on the different subscription.
D. The secondary server cannot be a lower performance tier than the primary.
D is incorrect. C is correct. Reference: https://docs.microsoft.com/en-us/azure/sql-database/sql-database-geo-replication-overview
“Both primary and secondary databases are required to have the same service tier.”
and
“Both primary and secondary servers for the databases in the failover group must be in the same subscription”