How Are Drug Efflux Pumps Spread Among Virulent Bacterial Strains

Multiple Choice

How are drug efflux pumps spread among virulent bacterial strains?

A) They are spread through generalized transduction.
B) Their genes are contained in plasmids that are transmitted among bacterial cells.
C) They are spread through conjugation between two virulent strains.
D) They are spread through transformation with Hfr plasmids.
E) DNA is released from bacterial cells previously infected with bacteriophages.