When troubleshooting a network, if you need to confirm the business traffic path, which of the following tasks may be required? (Multiple choice) 

When troubleshooting a network, if you need to confirm the business traffic path, which of the following tasks may be required? (Multiple choice) 
A . Confirm the data link layer service traffic path
B . Confirm the network layer business traffic path
C . Investigate business traffic path planning in the network design stage
D . Confirm the frequency of failure

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Answer: ABC