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The theory of operators on relations used to retrieve tuples is called relational:

AAnalogy
BAutonomy
CAlgebra
DAnatomy
Answer & Solution
Correct answer: C. Algebra
1. Unary and binary operators act on whole relations. 2. Their results are relations in turn. 3. That framework is relational algebra. _Source: OpenStax Introduction to Computer Science, Chapter 8, Data Management._
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