RDS can be used in combination with which of the following cloud services ,So as to ensure that the RDS instance is safely isolated from other services on the network?

Use mirroring to create a cloud server, Can not specify the size of the system disk

When the system disk fails, you can create a new cloud hard disk through the backup of the system disk and mount it to the cloud server as a system disk.

When the state of the alarm rule has not changed, the system will only send an alarm notification to the user when the state occurs for the first time.

cloud dedicated line service is a dedicated line network service that establishes a connection between local data centers and public clouds, What types of dedicated lines are currently only supported by cloud dedicated lines?