SAP provides specific tools designed for non-developers, often called key users or citizen developers, to create extensions using low-code or no-code approaches. SAP Build is SAP's unified low-code solution portfolio that empowers business users to create applications, automate processes, and design business sites without professional coding skills. Similarly, SAP Fiori extensibility apps, such as "Custom Fields and Logic" and "Custom Business Objects," are embedded directly within SAP S/4HANA Cloud. These apps provide a guided, no-code user interface for key users to adapt the system to their specific business needs.

B. SAP Business Application Studio: This is a professional integrated development environment (IDE) for developers and requires coding expertise to build complex applications and extensions.

D. SAP Cloud SDK: This is a set of libraries and tools for professional developers to build cloud-native applications that integrate with SAP solutions; it is not a low-code tool.

1. SAP Help Portal - SAP Build: "SAP Build is a low-code solution that provides a unified development experience with integrated user-centricity for creating applications and automating processes." This source explicitly defines SAP Build as a low-code solution for application creation. (Source: SAP Help Portal

What is SAP Build?)

2. SAP S/4HANA Cloud

Public Edition

2-System Landscape - Extensibility Guide: "In-app extensibility is the option for key users to extend the app within the SAP S/4HANA Cloud system itself. Key users can use the SAP Fiori apps that SAP provides to extend the application." (Source: SAP Help Portal

Extensibility Guide for SAP S/4HANA Cloud

Public Edition

Section: In-App Extensibility).

3. SAP Learning - S4C01 Implementing SAP S/4HANA Cloud

public edition: Unit 6

Lesson 2 on Extensibility discusses the different types of extensibility. It positions In-App Extensibility using Fiori apps as the tool for key users (non-developers) and Side-by-Side Extensibility using SAP Business Application Studio and SAP Cloud SDK for developers. This courseware is a primary source for the CS4CS2508 certification.