The Oracle Cloud Infrastructure (OCI) Database Management Service is a fully integrated feature of Oracle Database that provides a single console for managing and monitoring your Oracle Databases on OCI. It supports Oracle Database versions 11.2.0.4 and later, running on any edition, including Enterprise Edition, Standard Edition 2, and Express Edition1. It can monitor both OCI databases and external databases that are accessible from the OCI tenancy2. External databases are databases that are not deployed on OCI, but can be registered with the Database Management Service using a Database Management private endpoint and a Database Management agent3.
According to the documentation, the following types of external databases are supported by the Database Management Service3:
* Oracle Database on-premises
* Oracle Database on Oracle Cloud Infrastructure Classic
* Oracle Database on other cloud platforms
* Oracle Exadata Cloud@Customer
* Oracle Exadata Database Machine
Therefore, the correct answer is A and C, as they are both external databases that can be monitored by the Database Management Service. B is incorrect, because Oracle Autonomous Database is not an external database, but an OCI database that is managed by Oracle and does not require a Database Management agent4. D is incorrect, because Oracle 11gR2 Database is not a supported version for the Database Management Service, as it requires at least 11.2.0.41.
References: 1: Supported Database Versions and Features 2: About Database Management 3: Managing External Databases 4: Autonomous Database on Shared Exadata Infrastructure