On a Campus Network, the Gateway Is Usually Configured on the Aggregation

On a campus network, the gateway is usually configured on the aggregation layer. What advantages does this design have compared with configuring the gateway on the access layer? (Choose all that apply.)

A) Reduce the broadcast domain on the network and the probability of broadcast storms.
B) Achieve separate convergence of Layer 2 and Layer 3 to increase the convergence speed and network stability.
C) Properly design the Layer 2 network scale, reduce network segment allocation, and improve network management efficiency.
D) Allow configuring access devices as Layer 2 devices, reducing network construction costs.
E) Leverage the STP and VRRP mechanisms to improve network reliability.