Identify the clusters in Figure $8\mathrm{.}3$ using the center$-,$ contiguity$-,$ and density$-$

based definitions. Also indicate the number of clusters for each case and

give a brief indication of your reasoning. Note that darkness or the number

of dots indicates density. If it helps, assume center$-$based means K$-$means,

contiguity$-$based means single link, and density$-$based means DBSCAN.

$($b$)$

$($c$)$

$($d$)$

Figure $8\mathrm{.}3.$ Clusters for Exercise $5.$