Creating a dedicated Tableau user account and group on the Linux system A critical step in the Tableau Server installation process on Linux is creating a dedicated Tableau user account and group. This account is used to run Tableau Server processes and helps in managing permissions and ensuring that Tableau Server operates securely and efficiently within the Linux environment. Option A is incorrect because while having sufficient RAM is important, the specific requirement may vary and is not a direct step in the installation process. Option B is incorrect as running a pre-installation script is not typically a standard step in the Tableau Server installation process. Option D is incorrect because disabling SELinux is not recommended for security reasons and is not a required step for the Tableau Server installation.