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Relational Algebra equivalent in expressing power to A. TRC B. DRC restricted to safe Operation.

Relational Algebra equivalent in expressing power to A. TRC B. DRC restricted to safe Operation.

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Which of the following has same expressive power with regard to relational query language?

- Rational algebra and domain relational calculus
- Relational algebra and tuples relational calculus
- Relational algebra and domain relational calculus restricted to safe expression
- Relational algebra and tuples relational calculus restricted to safe expression

- a and b only
- c and d only
- a and c only
- b and d only