A company has added several new employees, which has caused the network traffic to increase by 200%. The network traffic

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A company has added several new employees, which has caused the network traffic to increase by 200%. The network traffic increase from the new employees was only expected to be 20% to 30%. The administration suspects that the network may have been compromised.
Which of the following should the network administrator have done previously to minimize the possibility of a network breach?

A. Create VLANs to segment the network traffic
B. Place a network sniffer on segments with new employees
C. Provide end user awareness and training for employees
D. Ensure best practices were implemented when creating new user accounts