A: This is not required for optimal performance. Storing data files, redo logs, and RMAN backup pieces in different disk groups is a common practice for organization and management purposes, but it is not a strict requirement for performance.
C: Combining hardware-based mirroring with ASM mirroring does not necessarily guarantee optimal performance; it can add unnecessary overhead.
E: While having separate disk groups for data and the fast recovery area can be a good practice for management, it is not strictly necessary for performance.
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