Read the following statements about a transcription unit. (i) The promoter lies towards the $5'$-end (upstream) of the structural gene, with reference to the coding strand. (ii) The strand with polarity $3' \rightarrow 5'$ acts as the template. (iii) The coding strand has the same sequence as the RNA, except that it has thymine in place of uracil. (iv) The terminator lies towards the $3'$-end (downstream) of the coding strand. (v) Both strands of the structural gene are copied into RNA. (vi) The coding strand is the strand that RNA polymerase reads to make the RNA. How many of the statements above are correct?