SAP Build is SAP's unified low-code solution designed for business users and citizen developers (non-developers) to create applications, automate processes, and build business sites using drag-and-drop functionality. SAP Fiori extensibility apps, also known as key-user or in-app extensibility, empower business experts to adapt standard applications directly within the system. This includes tasks like adding custom fields, modifying UIs, and creating custom business objects through guided, code-free Fiori applications, making it a no-code extension method.

B. SAP Cloud SDK: This is a Software Development Kit (SDK) with libraries and tools specifically for professional developers to build cloud applications, requiring significant coding knowledge.

D. SAP Business Application Studio: This is a full-fledged cloud-based Integrated Development Environment (IDE) for professional developers, not a low/no-code tool for business users.

1. SAP Help Portal - What Is SAP Build?: "SAP Build is a low-code solution that provides a unified development experience with integrated user-centricity for business users to create and augment enterprise applications

automate processes

and design business sites with drag-and-drop simplicity."

2. SAP Help Portal - Extensibility in SAP S/4HANA Cloud: "In-app extensibility allows you to create custom fields

data source extensions

and custom business objects in the SAP S/4HANA Cloud system itself. These extensions are created by key users... In-app extensibility is stable

as it is built-in

and upgrade-proof." This section describes the function of the Fiori extensibility apps.

3. SAP Help Portal - SAP Business Application Studio: "SAP Business Application Studio is a development environment available on SAP Business Technology Platform (SAP BTP)... It offers a modern desktop-like experience in the cloud

allowing developers to build

test

and deploy applications."

4. SAP Help Portal - What is the SAP Cloud SDK?: "The SAP Cloud SDK is a set of libraries

project templates

and tools for developers to build

extend

and connect to SAP solutions in a cloud-native way."