Which of the following entities represents a real-world object or concept in a database?

The concept of an entity in a database specifically refers to a real-world object or concept that can be identified and classified. Entities serve as the foundational elements in the organization of data within a database. For instance, in a database designed for a university, entities could include students, courses, and professors. Each of these represents something tangible or a distinct concept that has its own attributes (such as student ID, course name, etc.) and can exist independently in the database.

Attributes, although essential, describe the properties or characteristics of an entity rather than being entities themselves. A relationship refers to how two or more entities interact with one another, establishing connections in a database schema. A table, on the other hand, is the physical representation of an entity in a database, but it does not inherently encompass the concept associated with the entity itself. Thus, while all these terms relate to data management, the entity specifically defines the object or concept, making it the correct choice in this context.