two paths rị(1) and r2(1) intersect if there is a point P lying on both curves. We say that rị(t) and r2(1) collide if rị(10) = r2(10) at some time to. Which of the following statements are true? (a) If r|(1) and r2(1) intersect, then they collide. (b) If r|(1) and r2(1) collide, then they intersect. (c) Intersection depends only on the underlying curves traced by rị and r2, but collision depends on the actual parametrizations.

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