单选题Which of the following is the MOST important troubleshooting step？（）ATest the theory.BPerform a root cause analysis.CEstablish a plan of action.DMake one change at a time.
单选题
Which of the following is the MOST important troubleshooting step？（）
A
Test the theory.
B
Perform a root cause analysis.
C
Establish a plan of action.
D
Make one change at a time.
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