Final answer:
The most technical responsibility is held in an On Premises solution, where the user manages and maintains the entire infrastructure in-house. SaaS requires the least user responsibility, while IaaS and PaaS offer a mix of user and provider responsibility.
Step-by-step explanation:
When it comes to holding the most technical responsibility for a computing solution, the answer is A) On Premises. This refers to infrastructure and services that are maintained on an organization's physical site and under its direct control, rather than being hosted by a third-party provider.
In contrast, Software as a Service (SaaS) involves the least amount of technical managing responsibility for the user, as the provider maintains all aspects of the application and infrastructure.
Infrastructure as a Service (IaaS) gives the user control over the infrastructure (servers, storage, networking) but not the physical hardware. Platform as a Service (PaaS) provides a runtime environment for applications, development, and deployment tools, thus requiring the user to manage the applications and data only.