Principal fibers of PDL

# All of these are principal fibers of Periodontal ligament except:
A. Dentoalveolar crest fibers
B. Apical fibers
C. Horizontal fibers
D. Transseptal fibers

The correct answer is:
 D. Transseptal fibers

Principal Fibers of Periodontal Ligament are:

-Alveolar crest,

-horizontal,

-oblique,

-apical, and

-interradicular fiber bundles