Microsoft Certified: Azure Fundamentals (AZ-900) Practice Exam 2025 - Free AZ-900 Practice Questions and Study Guide

The correct answer is that none of the options have an upfront cost. In cloud computing models, such as Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS), services are typically billed on a pay-as-you-go basis, allowing businesses to avoid substantial initial investments.

IaaS offers virtualized computing resources over the internet, where users pay for what they use without needing to invest in physical hardware upfront. PaaS provides cloud-based platforms for developing, testing, and deploying applications without the burden of managing underlying infrastructure costs. SaaS, on the other hand, delivers software applications over the internet on a subscription basis, negating the need for upfront software purchases.

In summary, cloud services generally prioritize operational expenses over capital expenses, allowing businesses to be more agile and responsive to changing needs without significant upfront investments.