Which ready-to-use service in ArcGIS Desktop is specifically utilized for network analysis?

The correct answer is "Logistics." This ready-to-use service in ArcGIS Desktop is designed specifically for network analysis, which involves optimizing routes, managing fleets, and analyzing transportation networks. The Logistics service provides various tools and functionalities, such as calculating the best routes, determining service areas, and analyzing the flow of goods, which are essential for efficient transportation and distribution planning.

Other services, while useful, serve different purposes. The Elevation service is primarily focused on providing elevation data, which is important for terrain analysis but does not specifically address network analysis. The Hydro service relates to hydrological data, such as stream networks and watersheds, and is not tailored for logistics or transportation tasks. Geocoding services are geared towards converting addresses into geographic coordinates, which is an essential step in location-based analyses but does not cover the complexities of managing network logistics.