Which two are true about RMAN backups when using a media manager to write backups to tape when there are only two tape drives? (Choose two.)
A. SBT tape compression can be used even if no RMAN compression is configured.
B. Any backup set written to the SBT device in this configuration can contain a maximum of two backup pieces.
C. Any backup written to the SBT device in this configuration can contain a maximum of two backup sets.
D. SBT tape compression and RMAN backup compression should be used in parallel.
E. The SBT device should be configured to use PARALLELISM 2 to allow both tape drive to be used simultaneously.
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D is wrong
https://docs.oracle.com/en/database/oracle/oracle-database/19/bradv/tuning-rman-performance.html#GUID-1016F1F4-21D0-47B8-871A-FB582838D8A7
If you are backing up to tape and your tape device performs its own compression, then do not use both RMAN backup set compression and the media manager vendor’s compression. See the discussion of tuning RMAN’s tape backup performance in Tuning RMAN Performance.
AE