Which quadric surface is shaped like a saddle?

parabolic cylinder
elliptic paraboloid
hyperbolic paraboloid
elliptic hyperboloid
The widely sold fried snack food Pringles potato chips resemble a truncated hyperbolic paraboloid. The distinctive shape of these chips allows them to be stacked in sturdy tubular containers, fulfilling a design goal that they break less easily than other types of chip.
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parabolic cylinder
elliptic paraboloid
hyperbolic paraboloid
elliptic hyperboloid
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16
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23%
21
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15
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232
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22
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148
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113
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76
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38
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29%
17
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25%
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18%
4828
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18%
11
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41%
6%
31
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31%
12%
16
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30%
10%
10