Which of the Following Examples of Altered Transport or Reduced

Which of the following examples of altered transport or reduced permeability of an antimicrobial agent is correct? (Select all that apply)

A) Mycobacteria demonstrate selective permeability against most antibiotics because of the presence of mycolic acids in their cell walls
B) Tetracycline-resistant bacteria produce a membrane protein that pumps the drug out of the cell
C) Vancomycin is too large to pass through the peptidoglycan cell wall of Gram positive bacteria
D) Chloramphenicol diffuses easily across plasma membranes