Which task is performed by a background process in a database instance?

Connecting between a client process and a dispatcher is handled by the listener and the dispatcher itself, not a database background process.

Executing PL/SQL code is performed by a server process (either dedicated or shared), not a background process.

Creating dedicated server connections involves the listener spawning a new server process, not an existing database background process initiating this connection creation.

The Archiver (ARCn) background process is responsible for copying online redo log files to offline storage, known as archived redo logs. This archiving ensures that all database changes are preserved for recovery operations and can be used for media recovery or point-in-time recovery.