B. Data Guard and C. Data Pump.
Oracle Zero Downtime Migration (ZDM) uses Data Guard for near-zero downtime migrations by creating a physical standby database on the target environment, and Data Pump is often used to facilitate data transfer during migration to Autonomous Database.
GoldenGate is another migration tool that Oracle offers, but it is not specifically integrated with ZDM for migrations to Autonomous Database. Recovery Manager (RMAN) is typically used for backup and recovery, not for migration to Autonomous Database.
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