k-means clustering use cluster centers to model the data;.

here is a figure to illustrate the cluster centers.

enter image description here

there are 3 black dot in the figure represents 3 centers.

which expression is more clear, concise and idiomatic? I prefer the last one, just need a double confirmation.

expression_1: they are the 3 centers of 3 clusters?

expression_2: they are 3 centers of 3 clusters?

expression_3: they are 3 centers of clusters?

expression_4: they are 3 cluster centers?

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