YOU ISSUE THE COMMAND SHUTDOWN, AND IT SEEMS TO HANG

6. You issue the command SHUTDOWN, and it seems to hang. What could be the reason? (Choose the best answer.) A. You are not connected as SYSDBA or SYSOPER. B. There are other sessions logged on. C. You have not connected with operating system or password file authentication. D. There are active transactions in the database; when they complete, the SHUTDOWN will proceed.