A database specialist wishes to save costs on Amazon RDS instances by stopping them. Which statement below accurately describes the stopping of Amazon RDS instances?

Answer options:

A.You can stop a DB instance for up to seven days when it is in a single availability zone.
B.You can stop a DB instance for up to seven days when it is in a Multi-AZ configuration.
C.You can stop a DB instance for any duration when it is in a single availability zone.
D.You can stop a DB instance for any duration when it is in a Multi-AZ configuration.

Answer: B
Option B is CORRECT because it is possible to stop a DB instance for up to seven days. After several days, the DB instance is automatically started. This is required to perform the maintenance updates. Further, it is possible to stop and start a DB instance whether it is configured for a single Availability Zone or Multi-AZ. One limitation is Amazon RDS for SQL Server. You can`t stop an Amazon RDS for SQL Server DB instance in a Multi-AZ configuration. The question does not specify RDS for SQL Server.
Reference:
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_StopInstance.html