Concept:A relation in the relational model is a table, and data is stored in rows and columns.
Explanation:In the relational model, a relation is represented as a table.
Each row in that table is called a tuple.
It holds one complete set of related data values, also known as a record.
A column, on the other hand, represents an attribute of the relation.
Thus, a tuple is not a column, a key, or the whole two-dimensional table.
Answer:C. row of a table