Risk response refers to the actions identified and implemented to bring the risk exposure to an acceptable level. These actions are part of the risk management process and aim to reduce, avoid, transfer, or accept risks depending on their potential impact on the project. References: PRINCE2 Foundation Training Manual; PRINCE2 2017 Foundation handbook.

The authorization to deliver the project's products is given during the Directing a Project process. This process involves the Project Board's decision-making responsibilities, including granting permission to proceed with the project after the initiation phase and authorizing the delivery of stages as the project progresses.
References: PRINCE2 Foundation manual, PRINCE2 official resources

In PRINCE2, the collective name for individuals or groups who may be affected by or can influence a project is "Stakeholders." This includes a wide range of people such as customers, users, team members, and suppliers, each of whom has an interest in the project's successful execution and outcomes. References:
PRINCE2 Foundation manual, PRINCE2 official resources

The 'managing product delivery' process provides a controlled link between a team manager and the project manager. This process ensures that the work assigned to the team is authorized and managed according to the project's requirements, facilitating clear communication and effective delivery of project products.
= PRINCE2 7 Foundation handbook and online resources

The 'Initiating a Project' process in PRINCE2 is crucial for establishing a solid foundation for the project. This process is used to ensure that there is a shared understanding of the reasons for undertaking the project, the way its objectives will be achieved, and the related commitments of time and resources before substantial resources are committed. References: PRINCE2 7 Foundation Handbook and official training materials.