You`ve created a Cloudformation template as per your team`s request which is required for testing an application. The requirement is that when there is a request for stack deletion, the database should still be preserved for future reference.How can you achieve this using Cloudformation?

Answer options:

A.Ensure that the RDS is created with Read Replica`s so that the Read Replica remains after the stack is torn down.
B.In the AWS CloudFormation template, set the DeletionPolicy of theAWS::RDS::DBInstance’s DeletionPolicy property to “Retain.”
C.In the AWS CloudFormation template, set the WaitPolicy of the AWS::RDS::DBInstance’s WaitPolicy property to “Retain.”
D.In the AWS CloudFormation template, set the AWS::RDS::DBInstance’s DBlnstanceClass property to be read-only.

Answer - B
With the DeletionPolicy attribute you can preserve or (in some cases) backup a resource when its stack is deleted. You specify a DeletionPolicy attribute for each resource that you want to control. If a resource has no DeletionPolicy attribute, AWS CloudFormation deletes the resource by default. Note that this capability also applies to update operations that lead to resources being removed.
For more information on Cloudformation Deletion policy, please visit the below URL:
http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-attribute-deletionpolicy.html