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How can a pin fin heat sink be classified on the basis of fin arrangements?

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How can a pin fin heat sink be classified on the basis of fin arrangements?

(a) Pin, straight pin, flared pin

(b) Pin, circular pin, cylindrical pin

(c) Straight pin, circular pin, isotopic pin

(d) No classification

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Correct option is (a) Pin, straight pin, flared pin

For explanation: In general pin fins are classified as straight pin and flared pin. For the straight fin it was 44 °C or 6 °C better than the pin fin.  Pin fin heat sink performance is significantly better than straight fins when used in their intended application where the fluid flows axially along the pins rather than only tangentially across the pins.

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