Which of the following is the suggested point of entry for directing the central ray of the x-ray beam when exposing the maxillary incisors radiograph using the bisecting technique?
a. The tip of the nose
b. The ala of the nose
c. A point on the ala-tragus line below the pupil of the eye
d. A point on the ala-tragus line below the outer canthus of the eye
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