单项选择题
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.
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