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Armstrong axioms are called sound because?

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Armstrong axioms are called sound because?

(a) They are expensive

(b) They cannot generate correct functional dependencies

(c) They allow us to generate the complete closure

(d) They cannot generate incorrect functional dependencies

This question was addressed to me by my college director while I was bunking the class.

My doubt stems from Functional-Dependency Theory topic in division Relational Database Design of RDBMS

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Correct option is (d) They cannot generate incorrect functional dependencies

Explanation: Armstrong’s axioms are called as sound axioms because they do not generate incorrect functional dependencies.

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