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What is the work of the sigma factor in transcription?

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What is the work of the sigma factor in transcription?

(a) Helicase action

(b) Transcription initiation

(c) Transcription elongation

(d) Transcription termination

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

This question is from Transcription in portion Molecular Genetics of Life Sciences

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The correct answer is (b) Transcription initiation

Easy explanation: Sigma factor is only involved in transcription initiation not in elongation. The sigma factor is released from the core enzyme when the transcript reaches more than 8-9 nucleotide.

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