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Your team is developing a backend application to handle the business logic for an interactive voice response (IVR) system supporting a payroll application. The IVR system exhibits the following technical attributes: Each customer phone call is associated with a unique IVR session. A separate persistent gRPC connection is established to the backend for each session. Interruption of connections prompts the IVR system to establish new connections, causing slight latency for the call. Analysis of current call data reveals: Call duration spans from 1 to 30 minutes. Calls are predominantly made during business hours. Significant call surges occur around specific dates (e.g., paydays) or during major payroll changes. To minimize cost, effort, and operational overhead, where should you deploy the backend appliction?