Which expenditure has minimized an organization's requirements of purchasing systems and resources?

The correct answer is operational expenditures. Operational expenditures (OPEX) refer to the ongoing costs for running a product, business, or system. When organizations shift their spending to operational expenditures, they often adopt services such as Software as a Service (SaaS) or Infrastructure as a Service (IaaS). This model allows them to minimize the need for purchasing and maintaining their own systems and resources, as they can leverage cloud services provided by third-party vendors.

Using OPEX facilitates a pay-as-you-go or subscription model, which enhances flexibility, scalability, and reduces the upfront cost of acquiring hardware and software. This model helps organizations avoid significant capital expenditures, which require substantial investment in physical assets.

In contrast, capital expenditures (CAPEX) involve significant investments in physical assets like servers, which can lead to higher upfront costs and ongoing maintenance needs. Revenue and deferred revenue are not expenditures but rather financial metrics related to income generation and future income expectations, thus they do not directly impact the purchasing needs of systems and resources in the context of minimizing expenditures.