Which of the below mentioned statements will help the user understand the Multi AZ feature better?

A user has enabled the Multi AZ feature with the MS SQL RDS database server.

Which of the below mentioned statements will help the user understand the Multi AZ feature better?
A . In a Multi AZ, AWS runs two DBs in parallel and copies the data asynchronously to the replica copy
B . In a Multi AZ, AWS runs two DBs in parallel and copies the data synchronously to the replica copy
C . In a Multi AZ, AWS runs just one DB but copies the data synchronously to the standby replica
D . AWS MS SQL does not support the Multi AZ feature

Answer: C

Explanation:

Amazon RDS provides high availability and failover support for DB instances using Multi-AZ deployments. In a Multi-AZ deployment, Amazon RDS automatically provisions and maintains a synchronous standby replica in a different Availability Zone. The primary DB instance is synchronously replicated across Availability Zones to a standby replica to provide data redundancy, eliminate I/O freezes, and minimize latency spikes during system backups. Running a DB instance with high availability can enhance availability during planned system maintenance, and help protect your databases against DB instance failure and Availability Zone disruption. Note that the high-availability feature is not a scaling solution for read-only scenarios; you cannot use a standby replica to serve read traffic. To service read-only traffic, you should use a read replica.