This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
What is/are the method/methods of transferring information in a biofilm? 
Select and explain. 
A. Quorum Sensing, B. Conjugation, C. Plasmid transfer, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None