What does the $k$ in K$-$Nearest Neighbors represent?

The $\text{'}K\text{'}$ stands for "Karger," the name of the algorithm used

The $\text{'}$K$\text{'}$ represents how many data points are used to determine the label for an unlabeled data point

The $\text{'}K\text{'}$ represents how many hidden layers are used in the network

The $\text{'}K\text{'}$ represents the coefficient of the nonlinear variables used to determine the label for an unlabeled data point

None of the above