Which of the following relational query languages have the same expres – McqOptions

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1.	Which of the following relational query languages have the same expressive power?1.Relational algebra2.Tuple relational calculus restricted to safe expressions3.Domain relational calculus restricted to safe expressions
A.	II and III only
B.	I and II only
C.	I and III only
D.	I, II and III
Answer» E.

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