If both the strands copied during transcription, then what will happen?
a. The strands of DNA would be coding for two different proteins
b. Two RNA will be produced simultaneously complementary to each other
c. There will be formation of double helical RNA

If both strands are copied during transcription, then two complementary RNA strands will be produced simultaneously. These would have the tendency to form double-stranded RNA and if these two RNA strands do not form double helix these would code for two different types of proteins. Then, the whole exercise of transcription would be futile.