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单项选择题What can be done to enable the debug information for functions to be displayed when using ‘ksh - x’to debug a script?（）

A、Run the script using 'ksh -fx'.

B、Run the script using 'ksh -a function -x'.

C、Edit the script and add 'set -x' at the beginning.

D、Edit the script and add 'set -x' at the beginning of each function.

  • D

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