Which processes, when installed, will also include an installation of Data Engine unless already present?

The selection of this response is accurate because it reflects the components of Tableau Server architecture where certain processes have dependencies on the Data Engine, which serves as a critical component for data storage and management in Tableau.

When the Application Server, Backgrounder, VizQL Server, and Data Server processes are installed together, the Data Engine is required to support their functionalities unless it is already present in the system. The Application Server manages user requests and connections, while the Backgrounder handles the scheduling and execution of tasks that may require access to the Data Engine for performance data queries. The VizQL Server is responsible for rendering visual queries and often relies on the Data Engine to fetch data efficiently. Finally, the Data Server facilitates data sources and can provide a unified data access point for the various processes, again necessitating the presence of the Data Engine for optimal performance.

In contrast, the other listed processes either do not have a direct requirement for the Data Engine or are involved in functions that do not primarily depend on data storage and retrieval processes in the same manner.