In fingerprint classification, the number of deltas (triradii) present in an arch, a loop and a plain whorl respectively is:

• A Zero, one, two ✓
• B One, one, two
• C One, two, three
• D Zero, zero, two

Explanation

Delta counts define the Henry pattern groups: an arch has no triradius, a loop has exactly one delta beside its core, and a plain whorl has two deltas, one on either side of the concentric ridges. Composite or accidental patterns may occasionally show more than two deltas, but the classical whorl is defined by having two, and a single delta never defines a whorl.

Reference: Parikh's Textbook of Medical Jurisprudence, Forensic Medicine and Toxicology, 9th ed.

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