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The number of colors used by a proper edge coloring graph is called?

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The number of colors used by a proper edge coloring graph is called?

(a) k edge coloring graph

(b) x edge coloring graph

(c) m edge coloring graph

(d) n edge coloring graph

I have been asked this question in an online interview.

My enquiry is from Graph Coloring in portion Graph Coloring of Data Structures & Algorithms II

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Correct choice is (a) k edge coloring graph

To explain: A proper edge coloring graph ensures that no two incident edges has the same color. If it uses k colors in the process then it is called k coloring of graph.

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