Which two are responsibilities of an Oracle DBA regarding database availability, backup, and recovery?
A. decreasing Mean Time Between Failures (MTBF) by configuring FLASHBACK mode
B. implementing FLASHBACK DATA ARCHIVE to decrease MTBF
C. ensuring that critical components are protected by implementing redundancy
D. decreasing Mean Time to Recover (MTTR) by configuring FLASHBACK mode
E. implementing FLASHBACK DATA ARCHIVE to decrease MTTR
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