Let f1 be the set of parallelograms, f2 the set of rectangles, f3 the set of rhombuses, f4 the set of squares and f5 the set of trapeziums in a plane. Then f1 may be equal to (a) f2 ∩ f3 (b) f3 ∩ f4 (c) f2 ∪ f5 (d) f2 ∪ f3 ∪ f4 ∪ f1
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