In the DNA microarray exercise, what was used to capture the mRNA away from the tRNAs and rRNAs, and what property of mRNAs enabled their separation from the other RNAs?
A. Beads coated with polyTs or oligoTs, were used to capture mRNAs by virtue of their 3' polyA tails
B. Beads coated with polyTs or oligoTs, were used to capture mRNAs by virtue of their 5' polyA tails
C. Beads coated with polyAs, were used to capture mRNAs by virtue of their 3' polyT tails
D. Beads coated with polyAs, were used to capture mRNAs by virtue of their 5' polyT tails