A biotech firm launches a service on Azure and is billed for compute time and data usage. Which pricing model is this?

The Pay-as-you-go model is correct because it directly aligns with the description: customers are billed based on the resources they consume, such as compute time and data usage. This model offers flexibility and cost-effectiveness for varying workloads. A Flat-rate model would involve a fixed charge regardless of usage, which isn't described here. Tiered subscriptions typically offer different pricing levels based on committed usage or features, which is not the primary billing mechanism mentioned. Usage-independent is incorrect as it implies billing occurs irrespective of resource consumption, which contradicts the scenario.