Which statements regarding extensions are correct?

The statement that the fields are combined for a logical entity view is accurate because it highlights a key feature of how extensions work in Guidewire. When defining extensions in the context of entities, the underlying goal is to enhance the existing structure without disrupting the integrity of the base entity. By combining fields from both the base entity and its extensions, users can create a more comprehensive logical entity view that incorporates additional attributes or functionalities.

Extensions allow developers to add custom fields and functionalities specific to their business needs while still being able to utilize the core structure provided by Guidewire. This combination is beneficial for maintaining consistency and organization within the data model, allowing for more robust queries and reporting capabilities.

In contrast, while it's important to understand the context of ETI and ETX fields or the role of extensions, these do not directly encompass the essence of how the fields are viewed together in the schema. Therefore, focusing on the collaborative nature of fields within a logical structure provides clarity on the functionality and flexibility that extensions afford developers working within the Guidewire platform.