Which option is crucial for managing the integrity of a cloud-based application controlled by a department?

Managing the integrity of a cloud-based application hinges on adhering to organization-wide security policies. These policies typically include guidelines for data protection, access controls, risk management, and compliance with regulatory requirements. Proper adherence to these policies ensures that appropriate measures are in place to maintain the application's integrity—this involves addressing potential vulnerabilities, ensuring secure coding practices, and properly managing access to sensitive data.

By having robust security policies, an organization establishes a clear framework for how to handle various security issues, including data breaches or unauthorized access, which are critical to maintaining the integrity of the cloud-based application. Such policies also help in establishing accountability and defining responsibilities, which is essential for effective oversight and management of the application.

In contrast, while service availability, help desk procedures, and user access management are important components of IT operations, they primarily focus on operational efficiency, technical support, and user permissions, respectively. None of these alone directly ensure the integrity of the application without the underpinning governance provided by organization-wide security policies.