In which cloud computing arrangement does the cloud customer have the most control over their data and systems?

The arrangement that provides the cloud customer with the most control over their data and systems is Infrastructure as a Service (IaaS). In an IaaS model, customers are provided with virtualized computing resources over the internet. They can manage and control the operating systems, storage, applications, and any configurations necessary for their specific needs, which allows for significant customization and flexibility.

This level of control makes IaaS ideal for businesses that require greater management of their infrastructure, including the security measures they choose to implement on their virtual servers. Unlike other models such as Software as a Service (SaaS) and Platform as a Service (PaaS), which offer less control because they manage more of the infrastructure and platforms required for running applications, IaaS allows customers to maintain their own operating systems and deployed applications.

In this model, customers are responsible for everything from the applications they install to the security protocols they apply, making it the most versatile and controlled option when it comes to managing cloud resources and data.