Transcription unit is represented in the diagram given below.

Identify site (i), factor (ii) and Enzyme (iii) responsible for carrying out the process.
A. (i) Promoter Site, (ii) Rho factor (iii) RNA polymerase
B. (i) Terminator Site, (ii) Sigma factor (iii) RNA polymerase
C. (i) Promoter Site, (ii) Sigma factor (iii) RNA polymerase
D. (i) Promoter Site, (ii) Sigma factor (iii) DNA polymerase
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