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A polytree is called _______________

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A polytree is called _______________

(a) directed acyclic graph

(b) directed cyclic graph

(c) bipartite graph

(d) connected graph

The question was posed to me in a job interview.

My question is taken from Properties of Tree topic in chapter Trees of Discrete Mathematics

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Correct option is (a) directed acyclic graph

The explanation: A directed acyclic graph is known as a polytree whose underlying undirected graph is a tree. In other words, a directed tree is a directed graph which would be tree if the directions on the edges were ignored.

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