Which two statements are true about a buffer cache?
A. When a buffer is read from a buffer cache, it may be inconsistent and require undo data to make it consistent.
B. A buffer cache stores copies of data blocks from all files of the database.
C. Buffer access is kept efficient by maintaining a least recently used (LRU) list for dirty and clean buffers.
D. A buffer cache always resides completely in System Global Area (SGA).
E. A buffer cache contains exactly three pools: default, keep, and recycle pool.
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