Let F1 be the set of parallelograms, F2 be the set of rectangles, F3 be the set of rhombuses, F4 be the set of squares and F5 be the set of trapeziums in a plane. Then F1∪F2∪F∪3F4 is a subset of what? A) F1 B) F2 C) F3 D) F4 E) F5

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