Why do we need ids?

Consider again the situation were you wish to create an animated scatterplot of the housing price index against a state's real GDP. Why should you specify ids = ~state when creating your animation?

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Possible Answers

There could be missing values in the data set.
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The order of the rows may not be consistent.
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To ensure that the points on the scatterplot don't appear to "reshuffle".
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All of the above.
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