Collection of all concepts that must be used to describe database structure is calledstructural modelserver modeldatabase modelclient model

The correct answer to your question is database model.

Explanation

A database model is a collection of concepts that are used to describe the structure of a database. It defines how data is stored, organized, and manipulated. There are various types of database models, such as relational, hierarchical, network, and object-oriented models, each with its characteristics and use cases.

In contrast, the terms "structural model," "server model," and "client model" do not specifically refer to the comprehensive framework that describes database structures. While they may relate to aspects of system architecture and data handling, they do not encapsulate the entirety of database organization in the same way a database model does.

Thus, in the context of your question, "database model" is the most appropriate choice.