What should you do to ensure the correct users in finance receive a commonly used third-party app?

Enabling the third-party app in Marketplace Apps specifically for the Finance Organizational Unit (OU) is the right approach to ensure that the correct users in finance have access to the application. Marketplace Apps in G Suite allow administrators to manage and control which applications are accessible to specific users or groups within the organization.

By enabling the app at the OU level, you ensure that only those users within the Finance OU can utilize it, streamlining access based on their roles and needs. This method provides a tailored approach to app management, allowing for better oversight of which applications are available to different segments of the organization while ensuring compliance and security.

Other options don't provide a focused solution tailored to the specific needs of the Finance department. For example, enabling the app in SAML apps focuses on Single Sign-On integrations and may not directly manage access as effectively as Marketplace Apps. Disabling the app at the root level or restricting app installations would unnecessarily limit access for those who actually need the app in that specific department.