Determine the number of colors needed to label $V(K_n)$ such that each color class induces a subgraph with maximum degree at most $k$.
I'm not sure what this problem is even asking. I know that the complete graph of order $n$ has $n$ different color classes since every vertex is adjacent to every other vertex. Also, induced subgraphs of $K_n$ are also complete graphs of equal or smaller order. What is this problem asking me to do? I am lost. Any hints or solutions are greatly appreciated.