Question: For a given undirected, unweighted simple graph and a fixed positive integer k , the k - coloring problem asks us to assign a color

For a given undirected, unweighted simple graph and a fixed positive integer k, the k-coloring problem asks us to assign a color to each vertex, using at most k different colors, such that no two adjacent vertices have the same color.
(a) Just for a warm up explain why this graph cannot be 2-colored but can be 3-colored.

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