Final answer:
A row in a database that represents facts or corresponds to real-world entities is known as a Database tuple. It contains attributes based on the table's schema and represents an instance of an entity in the Database schema. The correct option is A.
Step-by-step explanation:
The row that represents certain facts or corresponds to a real-world entity or relationship in a database is known as a Database tuple. In the context of a database, a tuple can be considered a record that contains data fields corresponding to the schema of a table. Each field, known as an attribute, holds the value for some property of the entity or relationship that the tuple represents. Together, the attributes within a tuple provide a complete set of information about an instance of an entity or relationship.
For example, in a table representing students, a tuple would be a single student's record, with attributes like student ID, name, address, and course enrolled. The schema, which is the structure defining the database, would dictate what attributes are contained in each tuple.
A Database schema serves as a blueprint of how the data is organized in the database, while a database instance is the data stored in the database at any given time that conforms to this schema.