单选题Which of the following is the FIRST step when troubleshooting an issue？（）AIdentify the problem.BVerify full system functionality.CDocument all findings.DEstablish a theory of probable cause.
单选题
Which of the following is the FIRST step when troubleshooting an issue？（）
A
Identify the problem.
B
Verify full system functionality.
C
Document all findings.
D
Establish a theory of probable cause.
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