Which two workflows can only be accomplished using Map Viewer?

The chosen answer highlights the unique capability of the Map Viewer to support responsive mapping with real-time updates. This feature is particularly valuable for users who need to visualize dynamic data that changes frequently, such as monitoring traffic patterns, environmental conditions, or live feeds from sensors. Map Viewer allows these real-time updates to be displayed interactively on the map, enhancing user engagement and decision-making based on current data.

In contrast, the other workflows listed do not exclusively rely on Map Viewer. Performing analysis with geoprocessing tools can be accomplished through various platforms within ArcGIS, including ArcGIS Pro, which offers more extensive analytical capabilities. Styling vector tile layers can also be done in multiple environments and not solely in Map Viewer, allowing for flexibility across different applications. Clustering of a large number of point features, while it can be done in Map Viewer, is not restricted to that platform either; it can be performed in other ArcGIS applications depending on the context and specific requirements. Thus, C stands out as a distinctive and pivotal function of Map Viewer that enhances its utility for users requiring real-time mapping.