You are a DevOps engineer for a company. With stack policies in place, you have been requested to create a cost-effective rolling deployment solution with minimal downtime. How should you achieve this? Choose two answers from the options below.

Answer options:

A.Re-deploy your application using a Opsworks template to deploy Elastic Beanstalk.
B.Re-deploy with a CloudFormation template, define update policies on Auto Scaling groups in your CloudFormation template.
C.Use AutoscalingRollingUpdate attribute to specify how CloudFormation handles updates to Autoscaling Group Resource.
D.After each stack is deployed, tear down the old stack.

Answer - B and C
The AWS::AutoScaling::AutoScalingGroup resource supports an UpdatePolicy attribute. This is used to define how an Auto Scaling group resource is updated when an update to the CloudFormation stack occurs. A common approach to updating an Auto Scaling group is to perform a rolling update, which is done by specifying the AutoScalingRollingUpdate policy. According to the parameters specified, this retains the same Auto Scaling group and replaces old instances with new ones.
Option A is invalid because it is not efficient to use Opsworks to use Elastic Beanstalk.
Option D is invalid because this is an inefficient process to tear down stacks when there are stack policies available.
For more information on Autoscaling Rolling Updates, please refer to the below link:
https://aws.amazon.com/premiumsupport/knowledge-center/auto-scaling-group-rolling-updates/