Your database is configured in ARCHIVELOG mode, and a daily full database backup is taken by using RMAN. Control file autobackup is configured. Loss of which three database files can lead to an…

The loss of inactive online redo log files means that redo records required for point-in-time recovery beyond the latest archived log might be missing, leading to an incomplete recovery.

A temporary tablespace stores temporary segment data and does not contain user or system data that needs to be recovered to ensure transactional consistency; its loss does not typically lead to incomplete recovery.

A data file belonging to the SYSAUX tablespace contains auxiliary system data. While critical, its loss alone can often be recovered completely using RMAN backups and archived redo logs, assuming other vital files are intact.

The SPFILE (Server Parameter File) defines the instance's initialization parameters. Its loss can be restored from backup or recreated manually; it does not directly contain data requiring transaction recovery and thus doesn't cause incomplete recovery itself.

The active online redo log file group contains the most recent redo records that have not yet been archived. Losing this file group means that changes since the last archived log cannot be recovered, necessitating an incomplete recovery.

If all control files are lost, even with autobackup, the database structure and the mapping of data files to redo log files might be lost, making it difficult or impossible to reconstruct the database to a consistent state without incomplete recovery.