Comparing the Paralleling Technique with the Bisecting Technique, Which of the Following

Comparing the paralleling technique with the bisecting technique, which of the following statements is correct?

A) The paralleling technique is easy to achieve on all patients.
B) Proficiency should be achieved in both techniques.
C) The bisecting technique is more likely to be uncomfortable for the patient.
D) Once the full mouth series procedure is started, the radiographer must continue with the bisecting or the paralleling technique and not mix the two.