Platform as a Service (PaaS) is the correct answer because it provides the agricultural company with a complete platform including hardware, software, and infrastructure for developing, managing, and delivering applications over the internet. PaaS is ideal for supporting IoT data aggregation, analytics, and the required computational operations without the complexity of building and maintaining the infrastructure and environment typically needed for these tasks. Infrastructure as a Service (IaaS) provides a virtualized computing infrastructure managed over the internet, where the company would need to set up and manage middleware and application software. Software as a Service (SaaS) delivers application-level services, which would not directly cater to the development needs of the IoT data handling scenario. Serverless computing abstracts the server management but might not provide the level of control over data processing that a real-time agricultural decision-making system requires.