What does the following relational operation perform?

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answerhappygod
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What does the following relational operation perform?

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ρx(A1,A2,A3…) (E)
a) It returns the result of expression E with the previous attribute names
b) It returns the result of expression E renaming the attributes as A1, A2, …
c) It returns the result of the relation E but saves the old attributes
d) None of the mentioned
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