According to the book 'Understanding bioinformatics', RNA polymerase transcribes the anticoding strand in the direction from 3' to 5', so that the mRNA strand is produced from the 5' to the 3' end. However, according to Khan Academy's article, RNA polymerase builds an RNA strand in the 5' to 3' direction, adding each new nucleotide to the 3' end of the strand. Additionally, the codons of an mRNA are read in order from the 5' end to the 3' end. Which statement is correct?
1) The book 'Understanding bioinformatics' is correct.
2) Khan Academy's article is correct.
3) Both statements are correct.
4) Neither statement is correct.