Core Data Services (CDS) is a layer of SAP S/4HANA that provides a universal language to read and process data across different applications. CDS is based on SQL and extends it with domain-specific features and annotations. CDS views are reusable and can be consumed by various interfaces such as SAP Fiori, OData, or SQL. CDS views also enable the definition of semantic data models that expose the business logic and meaning of the underlying data sources. References = [SAP S/4HANA Cloud Public Edition - Introduction to Core Data Services], [SAP S/4HANA Cloud Public Edition - Core Data Services in SAP S/4HANA Cloud]

Tools that enable non-developers to create low/no-code extensions are designed to be user-friendly, requiring minimal to no programming knowledge, allowing business users to tailor applications to their specific needs. Among these tools, SAP Fiori extensibility apps and SAP Build stand out:
* SAP Fiori extensibility apps: These apps allow users to adapt the user interface and behavior of standard SAP Fiori apps without writing code. Users can personalize forms, fields, and workflows directly within the SAP Fiori environment, making it possible to adjust applications to meet specific business requirements.
* SAP Build: SAP Build is a suite of tools designed to enable users to create and enhance applications, automate processes, and design business sites with low-code or no-code approaches. It provides a user- friendly interface where users can drag and drop components, set up workflows, and integrate data without needing deep technical expertise.

The IT Contact is the person who is responsible for setting up the initial system access, provisioning users, and managing authentication for the SAP S/4HANA Cloud Public Edition project. The IT Contact should be identified and assigned immediately when the implementation begins, as they will receive all the SAP communications and notifications related to the system setup and configuration. The IT Contact should also be available and accessible throughout the project, and collaborate with the project team and the business stakeholders1.
The IT Contact should be someone who is a hands-on system administrator, not an executive. They should have the skills and experience to perform the system administration tasks, such as creating users, assigning roles, configuring identity providers, and troubleshooting issues. They should also be committed and engaged with the project, and provide feedback and participate in testing and training activities1.
Therefore, the correct answer is C, as the customer system admin is the most suitable person to be the IT Contact for the SAP S/4HANA Cloud Public Edition project. References = 1 How to Choose the Right IT Contact for Your SAP S/4HANA Cloud Public Edition Project - SAP Community

You can complete the following activities in the Maintain Business Roles SAP Fiori app:
* Assign business catalogs to a business role. Business catalogs are collections of SAP Fiori apps that are relevant for a specific business area or task. You can add one or more business catalogs to a business role to grant access to the corresponding apps1.
* Maintain restrictions. Restrictions are rules that limit the access of a business role to certain data or functions based on predefined criteria, such as company code, plant, or sales organization. You can maintain restrictions for a business role in a new UI that provides an overview of the restriction types and values2.
You cannot complete the following activities in the Maintain Business Roles SAP Fiori app:
* Maintain technical catalogs. Technical catalogs are collections of SAP Fiori apps that are grouped by technical criteria, such as application component or OData service. Technical catalogs are not assigned to business roles, but rather to business catalogs as dependencies3.
* Assign PFCG profiles to a business role. PFCG profiles are authorization profiles that are created and maintained in the Profile Generator (PFCG) transaction in the SAP GUI. PFCG profiles are not assigned to business roles, but rather to business users as part of the user role assignment4. References
= Maintain Business Roles; Maintain Business Roles and Business Users; Maintain Business Roles - New (Preview); Maintain Business Catalogs