What is the function of the aggregation tier in a traditional three tier Layer 2 network environment?

What is the function of the aggregation tier in a traditional three tier Layer 2 network environment?
A. The aggregation tier interfaces with lower tier Layer devices and provides a high-speed interconnect with the north-bound WAN edge device.
B. The aggregation tier relays packets between the lower tier Layer 2 devices and functions as the gateway to the upper tier Layer 2 device.
C. The aggregation tier provides network connectivity to end-user devices and other hosts and enforces network access policy.
D. The aggregation tier connects to the Internet and with lower tier Layer 2 devices to provide Layer 3 gateway services for the network.

Answer: B

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