The best fitting solution for the scenario mentioned is a serverless platform that allows running of code in response to specific events, automatically manages the underlying infrastructure, and scales with the frequency of events. This makes 'function as a service' offerings ideal for intermittent workloads that require no server provisioning. Lambda is a serverless compute service that supports event-driven processes and ensures the agency only pays for the compute time used, addressing both cost concerns and administrative overhead. It is directly aligned with the given requirements. Other options, which typically involve managing clusters or servers even in a managed capacity, are less suitable for this use case, particularly considering the sporadic nature of the workload and the agency's desire to avoid server management.