You’ve been in the hospital waiting room for a long time. After staring at the artwork for so long, you begin to notice that the drawings in the frames look a lot like graphs. To pass the time, you decide to figure out which graphs are planar and which are not. The figure below illustrates how you see the artwork on the hospital wall.
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Select the option below that contains only frames whose drawings represent planar graphs:
A) Only Frame 1;
B) Only Frame 3;
C) Frame 1 and Frame 2;
D) Frame 1, Frame 2, and Frame 3;
E) None of the above.
Original idea by: Melissa Araújo.
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