How must an OAuth request be registered in Salesforce?

An OAuth request must be registered in Salesforce as a Connected App because Connected Apps are specifically designed to integrate external applications with Salesforce while providing secure authentication through OAuth protocols. Connected Apps enable the use of APIs and allow for both user and app-level access to Salesforce data by implementing OAuth flows such as authorization code flow or implicit flow.

When registering a Connected App, developers can define settings such as callback URLs, OAuth scopes, and policies related to user authentication and token management. This is crucial for controlling access and ensuring secure connections between Salesforce and external systems.

In contrast, while options like Public App and Custom App are part of Salesforce’s ecosystem, they do not represent the mechanism for OAuth integration. Public Apps typically refer to those that do not require user authentication, while Custom Apps refer to applications that can be customized within the Salesforce environment but do not specifically pertain to OAuth authorization flows. Hence, only a Connected App facilitates the necessary configurations for OAuth requests in Salesforce, making it the correct choice.