Section: Volume B
Explanation/Reference: http://prince2.wiki/Starting_Up_a_Project#Purpose

Both statements about the Project Initiation Documentation (PID) are correct. The PID is essential for establishing a solid foundation for the project, ensuring that all stakeholders agree on the project's objectives and how it will be managed before the Project Board authorizes it. Additionally, the PID should be updated at the end of each stage to reflect the current status of the project, ensuring that it continues to meet the project's requirements and objectives. References: PRINCE2 Foundation official documentation and study materials.

The Managing Product Delivery process in PRINCE2 covers the work done by external suppliers, even if they are not using PRINCE2. This process ensures that the work assigned to external suppliers is managed effectively, focusing on the acceptance, execution, and delivery of project products according to the agreed requirements. References: PRINCE2 Foundation manual, PRINCE2 official resources