An antibiotic is moved into bacterial cells by a membrane channel protein, P. In some bacterial cells, resistance to this antibiotic has appeared after they acquired a mutation that changes P. This mutation stops the antibiotic from entering the cell. Which conclusions can be drawn about how resistance to this antibiotic arose in these bacteria?
- A1, 2 and 3
- B1 and 3 only
- C2 and 3 only
- D2 only