The central dogma represents the general directional flow of genetic information in the cell, but in some situations, there are refinements (modifications) of this rule. Which of the following statements about these exceptional refinements is CORRECT?
a. DNA serves as a template for the synthesis of RNA.
b. DNA serves as a direct template for the synthesis of proteins.
c. Retrotransposons movement is an example of these refinements.
d. RNA guides the synthesis of protein.