Q1: Choose the correct answer 1) A planar graph is, a) a graph that can be drawn in the plane without crossings. b) a graph that can be drawn in the plane without crossings - that is, so that no two edges intersect geometrically except at a vertex to which both are incident. c) a graph that can be drawn in the plane without cycles. d) a graph that can be drawn in the plane without faces.

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