Option B is correct. the equivalent of an object-oriented data structure or class instance in formal logic.
Strings, directed graphs, and undirected graphs are a few examples. The idea of languages as sets of strings is generalized as sets of relational structures. The logical data structures—the data tables, views, and indexes—are distinct from the physical storage structures thanks to the relational paradigm. Because of this separation, database managers can control the physical storage of data without influencing how that data is accessed logically. Tables, columns (or fields), rows (or records), and keys make up a relational database's fundamental building blocks (as specified by the relational model).
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