Which of the following fiber groups is a part of the alveodental ligament on a single-rooted adult tooth?

Question

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The main principal fiber group is the alveolodental ligament,which consists of five fiber subgroups: alveolar crest,horizontal,oblique,apical,and interradicular on multirooted teeth.The circular ligament is part of the gingival fiber groups and some consider these ligaments as a group to be part of the principal fibers but separate from the alveodental ligament.Another principal fiber other than the alveolodental ligament is the interdental ligament.

Which of the Following Fiber Groups Is a Part of the Alveodental