Suppose the graph of a function f(x, y) is a cone vertically situated with it's tip at the origin. Which of the following best decribes the level curves of f for z = 1, 2, 3? (a) Hyperbolas (b) Parabolas (c) Circles, evenly spaced. (d) Circles, getting closer together as the radius increases. (e) Circles, getting further apart as the radius increases.

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