This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Social Science, Mental Health & Genetics, Subject name: Social & Preventive Medicine
True about 'Customs' is/are 
Select and explain. 
A. Rigid rules and laws of society, B. No member can escape, C. Public take active part in its enforcement, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: (AH of the above)