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Which of the following can be implemented?

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Which of the following can be implemented?

(a) Conjunctive selection using one index

(b) Conjunctive selection using composite index

(c) Conjunctive selection by intersection of identifiers

(d) All of the mentioned

I got this question by my school principal while I was bunking the class.

My doubt is from Query Processing topic in chapter Query Processing and Optimization of RDBMS

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Right option is (d) All of the mentioned

For explanation: Conjunctive selection using one index, conjunctive selection using composite index and conjunctive selection by intersection of identifiers can be implemented. These are A7, A8, A9 algorithms that use an index.

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