What does the data dictionary identify?

A data dictionary is a centralized repository that stores metadata about the database structure. It acts as a reference guide for developers and administrators, detailing every element within the system. Specifically, it identifies field names to ensure consistent naming conventions, specifies field formats which dictate how data is presented or stored (like date formats), and defines field types such as integers, strings, or booleans to enforce data integrity. Since options A (Field names), B (Field formats), and C (Field Types) are all critical components documented within a data dictionary, selecting any single option would be incomplete. Therefore, 'All of these' is the correct answer as it encompasses the full scope of metadata management provided by a data dictionary.