Time-driven controls in PRINCE2 are specifically designed to monitor the progress of Work Packages and management stages at regular intervals. These controls ensure that the project stays on schedule and that any deviations are identified and managed promptly. References: PRINCE2 Foundation official study materials.

Reviewing the project product description to identify detailed requirements for each product aligns with the step of 'Describing the Quality Management Approach' in the quality management technique. This step involves defining how quality will be managed and controlled throughout the project, ensuring that all product requirements are understood and planned for in accordance with the project's quality expectations.References:
PRINCE27 Foundation guide on quality management.

The Plans theme in PRINCE2 is responsible for estimating the cost of delivering the project. This theme involves the development of plans that outline how, when, and by whom the project's objectives are to be achieved, including the necessary resources and associated costs. References: PRINCE2 Foundation official documentation and study materials.

PRINCE2 requires that the business case be formally verified by the project board at stage boundaries. This verification is essential to ensure that the project remains viable and desirable from a business perspective.
The project board's review of the business case at these critical points helps in deciding whether the project should continue into its next stage.References: PRINCE2 Foundation Manual

Risk probability in PRINCE2 refers to the measure of the likelihood that a particular risk will occur. It is a fundamental aspect of risk assessment, influencing the prioritization and management of risks within the project. References: PRINCE2Foundation Training Manual; PRINCE22017 Foundation handbook.