Which three are true about the default database buffer cache? (Choose three.)

Buffers containing block images may be selected for reuse based only on a Least Recently Used (LRU) algorithm. 

It is in the fixed area of the SGA. 

Its buffers can contain data block images for blocks that have a corresponding image in a data file. 

Buffers containing block images may be selected for reuse based only on a touch count algorithm. 

It can contain block images only for database blocks whose block size is equal to the buffer size. 

The keep and recycle cache memory is sub-allocated from memory allocated to the default buffer cache. 

Its buffers can contain data block images for blocks that have no corresponding image in a data file.