Which of the following is a prerequisite for the RemoteApp feature of PSM?

The prerequisite for the RemoteApp feature of Privileged Session Manager (PSM) being that the PSM Server must be a member of an Active Directory (AD) domain is crucial because this integration allows for better management of user authentication and access control. By being part of an AD domain, the PSM can leverage AD's centralized user management features, including Single Sign-On (SSO) capabilities, group policies, and security configurations. This ensures that only authorized users can access sensitive resources, enhancing the overall security of the environment.

In contrast, the other options do not align with the requirements for implementing the RemoteApp feature. For example, PSM does not require installation on a Linux server, as it is primarily designed to operate on Windows servers. Additionally, while firewall configurations might be necessary for network security, they are not a direct prerequisite for the RemoteApp feature itself. Similarly, isolation of the environment is a broader security measure but not a specific requirement for enabling the RemoteApp functionality in PSM.