假设用户正在执行UPDATE操作,此时用以下哪种方法可以关闭数据库()
A.SHUTDOWN或SHUTDOWN IMMEDIATE或SHUTDOWN ABORT B.SHUTDOWN或SHUTDOWN NORMAL或SHUTDOWN TRANSACTIONAL C.SHUTDOWN NORMAL或SHUTDOWN ABORT或SHUTDOWN IMMEDIATE D.SHUTDOWN或SHUTDOWN IMMEDIATE或SHUTDOWN TRANSACTIONAL E.SHUTDOWN ABORT或SHUTDOWN IMMEDIATE或SHUTDOWN TRANSACTIONAL