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
Which of the following facial expressions indicate the rest position 
Select and explain. 
A. Lips are even anteroposteriorly with slight contact., B. Skin around the eyes and chin is relaxed., C. Relaxation around the nostrils with unobstructed breathing., D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Facial expression: 
The following indicates rest position:

Lips are even anteroposteriorly with slight contact.
Skin around the eyes and chin is relaxed.
Relaxation around the nostrils with unobstructed breathing.

With experience the dentist learns to recognize, these features depicting rest position and will make measurements accordingly.