A. The two affected instances failed to fetch the new deployment.
B. A failed AfterInstall lifecycle event hook caused the CodeDeploy agent to roll back to the previous version on the affected instances.
C. The CodeDeploy agent was not installed in two affected instances.
D. EC2 Auto Scaling launched two new instances while the new deployment had not yet finished, causing the previous version to be deployed on the affected instances. Most Voted

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