Which of the following models defines the name of the data, data aliases, and description of system data?

A class model in object-oriented design describes objects, their attributes, and methods, but does not focus on data naming conventions or aliases at the data-element level.

An entity-relationship (ER) diagram shows the logical relationships and cardinality between data entities, not the detailed definitions or aliases of individual data fields.

A data dictionary is a centralized repository that stores metadata about each data element, including its name, alternate names (aliases), data type, allowable values, and a plain-language description. It ensures consistent interpretation and use of data across a system or organization. This directly matches the definition provided in the question.

A CRUD matrix maps which system components or user roles can Create, Read, Update, or Delete data, and does not document data names or descriptions.