Question: In a Shared E-UTRAN/NG-RAN scenario, what triggers the allocation of available spare capacity to a Participating Operator without human intervention, as per service level agreements?
Option 1: Scheduled maintenance of the Hosting Operator's network
Option 2: A significant increase in data traffic due to a large-scale event (e.g., festivals, sports events)
Option 3: Upgrades to the Participating Operator's core network
Option 4: The Hosting Operator's network reaching maximum planned capacity utilization
Explanation: This option is correct because the allocation of spare capacity without human intervention is typically triggered by unforeseen, high-demand events (like big mass-events as mentioned in the context) that require additional, unplanned capacity to maintain service quality. This aligns with dynamic capacity negotiation principles, which aim to adapt to sudden changes in network demand.