Interpreting the elbow plot

Based on the elbow plot you generated in the previous exercise for the lineup data:

lineup elbow plot

Which of these interpretations are valid?

Answer the question

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Possible Answers

Based on this plot, the k to choose is 2; the elbow occurs there.
press1
The k to choose is 5; this is where the trend levels off.
press2
Any value of k is valid; this plot does not clearly identify an elbow.
press3
None of the above.
press4