A user has written a script that is not running correctly and asks an administrator for help.  Without adding anything to the script， how can the administrator determine the cause of the problem？（）  

• A、Run the script with an ’sh -x’ in front.
• B、Run the script with a ’ksh -v’ in front.
• C、Type debug into the command line before running the script.
• D、Type ’set -x’ into the command line before running the script.