What is the purpose of an ArcGIS Web Adaptor?

The purpose of an ArcGIS Web Adaptor is to connect ArcGIS Server to a web server, facilitating improved resource access and enhanced security. By acting as an intermediary, the Web Adaptor allows for a more secure integration between the web server and ArcGIS Server. This setup helps in managing the connections and requests that come from users accessing GIS resources through web applications.

Using a Web Adaptor ensures that the communication between clients and the GIS server adheres to organizational security policies, which may include authentication and authorization protocols. Additionally, it can help in load balancing and improving the overall performance of web applications that utilize ArcGIS Server, by allowing better scaling and management of resources.

Other options, while related to GIS and web services, do not accurately describe the specific function of the Web Adaptor within the ArcGIS infrastructure. The focus of the Web Adaptor on security and access management makes option B the correct and most relevant choice.