Which of the following description about the CIFS protocol are correct ? ( multiple choice )

Which of the following description about the CIFS protocol are correct ? ( multiple choice )
A . using file record locks, to prevent file or record be covered by other users
B . running on TCP/UDP protocol
C . When the client application has recovery connection functions, can automatically restore the connection and reopen the interrupted file
D . CIFS fault-tolerant function depends on whether the application is enabled CIFS fault tolerance function

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Answer: AD