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The selection of enhanced scalability due to the reduction of control-plane operations as the key benefit of using EVPN in a data center environment highlights a crucial aspect of how EVPN operates.

EVPN, or Ethernet VPN, utilizes a control plane based on MP-BGP (Multiprotocol Border Gateway Protocol), which allows for efficient distribution of endpoint reachability information across data centers. This results in a scalable architecture that minimizes the amount of control-plane overhead typically required for traditional Ethernet solutions.

By offloading significant control-plane tasks to the BGP routing protocol, EVPN enables the network to scale better with a larger number of endpoints without degrading performance. This approach also simplifies the management of diverse Layer 2 and Layer 3 services, allowing for more efficient use of bandwidth and resources within the data center.

Other options present characteristics that do not accurately capture the essence or fundamental advantages of EVPN. Increased complexity in network management contradicts the streamlined processes afforded by EVPN. Support for multicast traffic is indeed a benefit of EVPN, but it is not the most critical advantage compared to scalability. Lastly, the option regarding inability to connect multiple platforms is inaccurate, as EVPN is designed to support multi-vendor environments and interconnectivity among various network platforms. Thus