A CloudFormation stack contains an RDS DB instance (AWS::RDS::DBInstance) resource. You use a Jenkins job to perform the stack update when the CloudFormation template has a change. When a replacement of the DB instance resource is required during a stack update, you want to ensure that the old DB instance is retained after the new DB instance is created. Which of the following resource attributes would you use for the DB resource?

Answer options:

A.DeletionPolicy
B.UpdateReplacePolicy
C.UpdatePolicy
D.CreationPolicy

Correct Answer: B
Option A is incorrect because DeletionPolicy is used for resources deleted when a stack is deleted, or when the resource definition itself is deleted from the template as part of a stack update. In this question, the stack is being updated instead of deleted.
Option B is CORRECT because UpdateReplacePolicy applies to resources replaced during stack updates. In this question, you should configure the DB instance with “UpdateReplacePolicy: Retain”.
Option C is incorrect because the UpdatePolicy attribute specifies how AWS CloudFormation handles updates to the AWS::AutoScaling::AutoScalingGroup, AWS::ElastiCache::ReplicationGroup, AWS::Elasticsearch::Domain, or AWS::Lambda::Alias resources. It does not work with DB instance resources.
Option D is incorrect because CreationPolicy does not specify whether or not a DB instance would be retained during a stack update.
Reference:
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-attribute-updatereplacepolicy.html