Answer: ABEG
More info on RMAN Multisection Backups
For backing up very large data files, RMAN provides multisection backups as a way to parallelize the backup operation within the file itself, such that sections of a file are backed up in parallel, rather than backing up on a per-file basis.
For example, a one TB data file can be sectioned into ten 100 GB backup pieces, with each section backed up in parallel, rather than the entire one TB file backed up as one file. The overall backup time for large data files can be dramatically reduced.
https://docs.oracle.com/database/121/VLDBG/GUID-FA70B6EF-0C8B-435B-98C9-CDEBCDCED145.htm#VLDBG1576
Why are they multisection backup?
Because they are separated as 100M per section?
Or the tablespace are much larger than archive log, sp file and temp table?
BACKUP ARCHIVELOG ALL SECTION SIZE 25M; This command does not fail, but only creates archivelog backups, not multi section backups.
BACKUP SPFILE SECTION SIZE 1M; This command also does not fail, but only creates normal backup, not multi section backups.
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