which three situations must you use a recovery catalog?

In which three situations must you use a recovery catalog?

A.
when you want to store RMAN global scripts that can be used across multiple databases

B.
when you want to restrict the amount of space used by backups

C.
when you want to perform incremental backups by using a block change tracking file

D.
when you want to list data files that were in a target database at a given time by using the AT clause with the REPORT SCHEMA command

E.
when you want to maintain backup metadata longer than the period specified by the CONTROL_FILE_RECORD_KEEP_TIME parameter