Schematic structure of a transcription uit is given below. Select the correct option :
A. A - Promoter, B - Structural gene, C - Terminator, D - Coding strand
B. A - Terminator, B - Structural gene, C - Promoter, D - Coding strand
C. A -Structural gene, B - Promoter, C - Terminator, D - Coding strand
D. A -Promoter, B - Structural gene, C - Coding strand, D - Terminator