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What is the role of sigma factor in bacterial RNA polymerase?

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What is the role of sigma factor in bacterial RNA polymerase?

(a) Catalyzing RNA synthesis

(b) Positioning RNA polymerase correctly on the DNA template

(c) Terminating RNA synthesis

(d) Unwinding DNA template

I have been asked this question in an interview for internship.

My doubt is from DNA-Dependent Synthesis of RNA in chapter DNA, RNA and Protein Metabolism of Biochemistry

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The correct choice is (b) Positioning RNA polymerase correctly on the DNA template

To elaborate: Sigma factor enables specific binding of RNA polymerase to promoter.

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