1. For Answer B (FTP Adapter Usage): Oracle Cloud Infrastructure Documentation, Using Integrations in Oracle Integration 3, "Use the Embedded SFTP Server in Oracle Integration", Section: "Use the FTP Adapter to Connect to the Embedded SFTP Server". This section explicitly states, "You can use the FTP Adapter to connect to the embedded SFTP server from an integration."
2. For Answer D (Disabled by Default): Oracle Cloud Infrastructure Documentation, Using Integrations in Oracle Integration 3, "Use the Embedded SFTP Server in Oracle Integration", Section: "Enable the Embedded SFTP Server". The first sentence reads, "The embedded SFTP server is disabled by default. A service administrator must enable it."
3. For Answer A (External Client Access): Oracle Cloud Infrastructure Documentation, Using Integrations in Oracle Integration 3, "Use the Embedded SFTP Server in Oracle Integration", Section: "Manage Users and Groups". This section details how to create users and grant them permissions to folders, which they can then access using an SFTP client.
4. For Answer C (Admin Role for REST API): Oracle Cloud Infrastructure Documentation, REST API for Oracle Integration, "File Server", Section: "Manage File Server". The documentation specifies that the "Required Role" for these API operations is ServiceAdministrator.