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Which of the following is not a feature of a good relational design?

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Which of the following is not a feature of a good relational design?

(a) Specifying primary keys

(b) Specifying foreign keys

(c) Preserving integrity constraints

(d) Allowing redundancy of attributes

I got this question in unit test.

My doubt is from Features of Good Relational Design in division Relational Database Design of RDBMS

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Correct option is (d) Allowing redundancy of attributes

To elaborate: Allowing redundancy of attributes makes it very difficult for data extraction. So, It is not a good relational design feature.

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