Which two functions are performed by the core layer in a three-tier architecture? (Choose two.)

Which two functions are performed by the core layer in a three-tier architecture? (Choose two.)
A . Ensure timely data transfer between layers.
B . Provide uninterrupted forwarding service
C . Inspect packets for malicious activity.
D . Police traffic that is sent to the edge of the network.
E . Provide direct connectivity for end user devices

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Answer: BC