1. Esri ArcGIS Enterprise Documentation. "ArcGIS Server licensing roles." ArcGIS Enterprise 11.2 Documentation. Accessed May 2024.
Reference Detail: In the section describing the ArcGIS Image Server role
the documentation states
"The ArcGIS Image Server license role allows you to publish image services from mosaic datasets
raster datasets
and raster products... An ArcGIS Image Server license also includes the capabilities of the ArcGIS GIS Server Advanced license." This directly confirms that the Image Server role fulfills both requirements in the question.
2. Esri ArcGIS Enterprise Documentation. "What is an image service?" ArcGIS Enterprise 11.2 Documentation. Accessed May 2024.
Reference Detail: This page clarifies that an image service is the primary mechanism for serving raster and imagery data and that "To publish an image service
you must have the ArcGIS Image Server role licensed for your ArcGIS Server site." This confirms the necessity of the Image Server role for the first requirement.