ABCD is a square. One point on each of AB and CD; and two distinct points on each of BC....CSAT

ABCD is a square. One point on each of AB and CD; and two distinct points on each of BC and DA are chosen. How many distinct triangles can be drawn using any three points as vertices out of these six points?

(a) 16
(b) 18
(c) 20
(d) 24

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