BAdIs are classified under which of the following extension types in SAP S/4HANA Cloud?

BAdIs, or Business Add-Ins, are classified under the extension type known as Developer Extension in SAP S/4HANA Cloud. This classification is appropriate because BAdIs provide a way for developers to add custom logic to standard SAP applications without modifying the original codebase. They allow for enhancement of functionality by implementing custom business logic that can integrate into standard processes.

In the context of SAP S/4HANA, Developer Extensions are meant for scenarios where a developer needs to create complex customizations or integrations that leverage the existing capabilities of the core system while maintaining upgradeability. BAdIs enable this by allowing developers to implement enhancement points that the system recognizes and uses during execution, thereby keeping custom developments aligned with updates from SAP.

Key User Extensions are designed for non-technical users who wish to personalize or configure specific aspects of the software through simpler means, without requiring programming skills. Classical user exits are an older method for customizations that have largely been superseded by more advanced and flexible options like BAdIs. Side-By-Side Extensions, while applicable in a broader context of extending SAP functionalities outside the main platform, do not specifically pertain to BAdIs, which are inherently tied to the core SAP system for in-memory processing