單項(xiàng)選擇題

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.

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