What is required for cloud computing users to follow the on-demand self-service model?

The on-demand self-service model in cloud computing empowers users to manage their resources independently, which means they can provision and configure services without requiring direct interaction with service providers. This model emphasizes user autonomy, allowing individuals to select and activate services as needed, anytime and from anywhere.

Option B highlights that users must have complete autonomy after selecting their services, which aligns directly with the principles of on-demand self-service. This autonomy ensures that users can scale their resources up or down based on their requirements without delays, making it a hallmark of cloud efficiency.

In contrast, other options suggest limitations that contradict the essence of the on-demand self-service model. For example, stating that services must be fully operational without user intervention might imply a lack of user control or flexibility, while depending on service providers for resource application suggests a reliance that diminishes the self-service aspect. Lastly, limiting access to services during specified hours would undermine the immediate availability and flexibility that cloud computing offers, which is fundamental to the on-demand self-service model.