Which statement is true regarding database links?

The chosen answer is accurate because it reflects the functionality of database links within Oracle Autonomous Database. A database link is a connection that allows access to objects (like tables and views) in a different database. In the context of Autonomous Database, creating a database link allows it to connect to a remote database, facilitating direct operations on remote objects.

This capability enables users to perform various database operations across different systems seamlessly, enhancing integration and data management between multiple databases. When Autonomous Database connects to remote databases using a database link, it can execute queries, join tables, and retrieve data across the link as if it were local, which is crucial for distributed applications.

While calling PL/SQL procedures or connecting to Autonomous Database from a remote database may seem plausible, these functionalities either do not represent the primary utility of database links or miss the direct definition of how links are intended to operate within the Oracle ecosystem. Options regarding creating a database link from one Autonomous Database to another or connecting to Autonomous Database from a remote database do not fully capture the more typical use case described in the correct choice.