Select those statements that are true about the treatment of biofilm infections.
a. Bacteria in biofilms have different susceptibility patterns than their free-living counterparts.
b. Aminoglycosides generally are very effective against bacteria in biofilms.
c. Bacteria in biofilms may be inhibited by drugs that interfere with quorum sensing.
d. Antibiotics' penetration of biofilms may be improved by adding DNase with the antibiotic.
e. Bacteria in biofilms tend to be more antibiotic sensitive.
f. Antibiotic-impregnated biomaterials that are inserted into the body prevent biofilm development on those materials.