Which two statements about Oracle Direct Network File System (NFS) are true?（）
- A It bypasses the OS file system cache.
- B A separate NFS interface is required for use across Linux, UNIX, and Windows platforms.
- C It uses the operating system kernel NFS layer for user tasks and network communication modules.
- D File systems need not be mounted by the kernel NFS system when being served through Direct NFS.
- E Oracle Disk Manager can manage NFS on its own, without using the operating system kernel NFS driver.