Which solution will resolve this error?

Explanations:

This option correctly addresses the cross-account access issue. By configuring the application account’s deployment IAM role to trust the centralized DevOps account and allowing thests:AssumeRoleaction, the CodeBuild project can assume this role. Additionally, granting the necessary permissions to access the EKS cluster and updating theaws-authConfigMap to map the role ensures that the deployment can connect to the EKS cluster successfully.

This option is incorrect because it suggests configuring the centralized DevOps account’s deployment IAM role to trust the application account. However, this does not address the need for CodeBuild in the DevOps account to assume a role in the application account for deploying to the EKS cluster. The deployment role in the application account must be able to trust the DevOps account instead.

This option is incorrect as it proposes the use ofsts:AssumeRoleWithSAML, which is not relevant in this context. The deployment from CodeBuild in the centralized DevOps account to the application account’s EKS cluster requiressts:AssumeRole, not SAML. Furthermore, the deployment IAM role needs to be set up correctly to facilitate access to the EKS cluster, which this option fails to address adequately.

This option is incorrect because it suggests configuring the application account’s deployment IAM role to trust the AWS Control Tower management account. However, the management account is not directly involved in the deployment process between the centralized DevOps account and the application account. The deployment IAM role should trust the DevOps account instead for proper role assumption and access to the EKS cluster.