In a complex network environment with financial, OA ( Office Automation System , Office Automation), production, and even more business systems, which of the following should be first concerned during the network troubleshooting?

 In a complex network environment with financial, OA ( Office Automation System , Office Automation), production, and even more business systems, which of the following should be first concerned during the network troubleshooting?
A .  Assignment of IP address
B .  Model of network equipment
C .  Data flow direction of each business system
D .  The environment of the computer room

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Answer: C