How should the Engineer upgrade the instance while minimizing downtime?

A company used AWS CloudFormation to deploy a three-tier web application that stores data in an Amazon RDS MySQL Multi-AZ DB instance. A DevOps Engineer must upgrade the RDS instance to the latest major version of MySQL while incurring minimal downtime.

How should the Engineer upgrade the instance while minimizing downtime?
A . Update the EngineVersionproperty of the AWS::RDS::DBInstanceresource type in the CloudFormation template to the latest desired version. Launch a second stack and make the new RDS instance a read replica.
B . Update the DBEngineVersionproperty of the AWS:: RDS::DBInstanceresource type in the CloudFormation template to the latest desired version. Perform an Update Stackoperation. Create a new RDS Read Replicas resource with the same properties as the instance to be upgraded. Perform a second Update Stackoperation.
C . Update the DBEngineVersionproperty of the AWS::RDS::DBInstanceresource type in the CloudFormation template to the latest desired version. Create a new RDS Read Replicas resource with the same properties as the instance to be upgraded. Perform an Update Stackoperation.
D . Update the EngineVersionproperty of the AWS::RDS::DBInstanceresource type in the CloudFormation template to the latest version, and perform an Update Stackoperation.

View Answer

Answer: A