These UI layouts in the Now Platform are called B. Workspaces.
Workspaces in ServiceNow provide tailored experiences for different personas, processes, and interfaces, such as Default, Major Incidents, Self Service, and Mobile.
E. Views: NO. These are saved versions of personalized forms or lists, defining which fields appear and in what order, but they do not provide the tailored, persona-specific UI layouts.
So, the tailored UI layouts for different personas, processes, and interfaces in the Now Platform are indeed called Workspaces.