Which of the Following Is Correct with Regard to Cervical

Which of the following is correct with regard to cervical traction?

A) Approximately 30 to 45 pounds of traction force is required to achieve vertebral separation in the cervical spine.
B) Patients always have better outcomes when the traction force is as high as they can tolerate.
C) Cervical traction applied with the patient sitting requires more force to achieve the desired effect than when applied with the patient supine.
D) A person with a history of temporomandibular joint problems should not have any form of cervical traction.