What are three purposes of the RMAN "FROM" clause? 

Answer options:

A. to support PUSH-based active database duplication
B. to support synchronization of a standby database with the primary database in a Data environment
C. to support PULL-based active database duplication
D. to support file restores over the network in a Data Guard environment
E. to support file recovery over the network in a Data Guard environment

BDE

* With a control file autobackup, RMAN can recover the database even if the current control file, recovery catalog, and server parameter file are inaccessible. * RMAN uses a recovery catalog to track filenames for all database files in a Data Guard environment. A recovery catalog is a database schema used by RMAN to store metadata about one or more Oracle databases. The catalog also records where the online redo logs, standby redo logs, tempfiles, archived redo logs, backup sets, and image copies are created.