There are four main groups of gingival fibers based on how they attach:
A. Circular, Transseptal, Alveolar Crest, Apical
B. Horizontal, Oblique, Interradicular, Transseptal
C. PDL, Cementum, Dentin, Enamel
D. Supraperiosteal, Submucosal, Subepithelial, Subgingival