Exam AWS Certified Developer Associate topic 1 question 386 discussion

The most cost-effective solution is to configure CodeBuild jobs on AWS for each branch build process. This is because CodeBuild is a fully managed service that scales automatically, so you only pay for the resources you use. Configuring an Amazon EC2 instance with the CodeBuild agent would be more expensive, as you would need to pay for the EC2 instance even when it is not in use. Configuring the CodeBuild agent to build the code in the local system would not be feasible, as it would require each developer to have a local machine that is powerful enough to build the code. Configuring a Jenkins plugin for CodeBuild would also be more expensive, as you would need to pay for a Jenkins license. Therefore, the most cost-effective solution is to configure CodeBuild jobs on AWS for each branch build process. This will allow you to build your code before it is pushed to the main branch, without incurring any additional costs. So the answer is (B).

it'c C clearly.

Answer is C: COST is the key word here https://docs.aws.amazon.com/codebuild/latest/userguide/use-codebuild-agent.html

But configuring CodeBuild jobs on AWS for each branch build process is the most cost-effective solution as it will allow developers to build code before pushing it to the main branch. This way, developers can identify and resolve any issues in the code before it is merged into the main branch, reducing the number of build failures and increasing the efficiency of the build process. Additionally, CodeBuild is a fully managed service, so there is no need to set up and manage additional infrastructure, making it a cost-effective solution.

MOST cost-effectively is the keyword here. The answer is C.

From real life experience, you may not own the entire pipeline and not always possible to clone everything and build locally. Plus, the question is asking "before push code to main branch". A normal setup is to have gated checkin on feature branch, so changes only made it to source if build succeeded. Then use pull request to merge feature into dev/master. Can't guarantee that's the exam is trying to ask, but that's how it's done.

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