单项选择题
On a Cisco Catalyst 4500 Series, the fail LED is lit for one if its two power supplies. Which command would you use to check on this problem ?（）
A. Show module
B. Show errdisable detect
C. Show environment
D. Show diagnostic content
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A. show configuration
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As an experienced Network Engineer, you are required to implement the security architecture assessment. Which of the following statement describes the most important reason for that?（）
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