Redo the k$-$means problem step by step as class by selecting customers $1,8$ and $18$ as initial centroids.

You may refer to Chapter $4$ Customer Segmentation K Means.xls$.$ Feel free to use my spreadsheet: Chapter $4$ Customer Segmentation K Means$\_$hw$.$xls$.$

After Iter$1,$ which cluster does customer $1$ belong to$?$

Question $6$ options:

A$)$

cluster $1$

B$)$

cluster $2$

C$)$

cluster $3$

D$)$

none of above