Your team uses Elastic Beanstalk to manage a legacy JAVA application for a financial system. The Elastic Beanstalk environment is based on Amazon Linux. Now you need to update the operating system to Amazon Linux 2 in order to take advantage of the latest Elastic Beanstalk functionality. During the update, there should be minimal service impact to the application. Which of the following options describes the correct order to perform the operating system update?

Answer options:

A.5 > 2 > 1 > 4
B.2 > 3 > 1 > 5
C.3 > 4 > 1 > 5
D.4 > 2 > 3 > 1

Correct Answer: C
Option A is incorrect because terminating the old environment is not the correct procedure to update the operating system. So, step 5 should not be in the first position.
Option B is incorrect because step 2 is the unwanted step that does not describe any updates.
Option C is CORRECT because this sequence describes the blue/green update strategy by creating a new environment, testing it and then swapping the DNS for the production environment.
Option D is incorrect because issues cannot be followed before creating and deploying the code. The sequence does not describe any of the update strategies.
References:
https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/environment-platform-update-managed.html
https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features.platform.upgrade.html