有道033的题请教一下大家：

Which two statements are true of the buffer cache? (Choose two) A. In Oracle9i, the buffer caches can be individually sized. B. Blocks in the buffer cache may be in one of several states. C. In Oracle9i additional buffer caches can be dynamically added. D. The blocks in the buffer cache are managed using two or more lists, depending on the number of buffer caches in use. E. Blocks in the buffer cache may be in one of two states, either free or dirty.