According to the Upgrade the Java Agent document1, one of the reasons to upgrade AppDynamics
agents is to resolve agent issues, such as bugs, performance problems, or compatibility issues with
the Controller or the monitored application. Another reason to upgrade AppDynamics agents is to
take advantage of new features, such as enhanced metrics, dashboards, alerts, or integrations, that
are introduced in newer agent versions. Therefore, the correct answer is A and D. Database issues
and application upgrade are not directly related to the agent upgrade, unless they affect the agent
functionality or compatibility. Reference:
Upgrade the Java Agent
