What must be enabled in a map service to allow users to perform edit operations?

To allow users to perform edit operations within a map service, it is essential to enable the Feature Access Capability. This capability specifically grants the ability to create, update, delete, and perform other editing actions on features within the map service.

When enabled, Feature Access allows clients to interact with the data in a meaningful way, such as editing attribute values or geometries of the features presented in the service. It is designed to support operations over feature layers, which is crucial for applications that require real-time data manipulation or updates by users.

The other options do not directly relate to enabling editing capabilities. Service Caching refers to the performance enhancement of map services by storing map images, while Secure Access ensures that the service is protected, but does not provide editing functionalities by itself. Layer Visibility controls which layers are displayed in the map but does not impact the ability to edit features. Thus, having Feature Access Capability is the necessary setting for enabling edit operations in a map service.