What does the ‘k’ stand for in k-nearest-neighbors?

 What does the ‘k’ stand for in k-nearest-neighbors?

  •  the number of samples in the dataset
  •  the number of training datasets
  •  the number of nearest neighbors to consider in classifying a sample
  •  the distance between neighbors: All neighboring samples that are ‘k’ distance apart from the sample are considered in classifying that sample.

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