Let \(𝐺(𝑉, 𝐸)\) be an undirected and unweighted graph with 100 vertices.…

GATE · 2025 · CS · Set 1 · Computer Science & IT

Let \(𝐺(𝑉, 𝐸)\) be an undirected and unweighted graph with 100 vertices. Let \(𝑑(𝑢, 𝑣)\) denote the number of edges in a shortest path between vertices \(u\) and \(v\) in \(V\). Let the maximum value of \(𝑑(𝑢, 𝑣), 𝑢, 𝑣 ∈ 𝑉\) such that \(𝑢 ≠ 𝑣\), be 30. Let \(T\) be any breadth-first-search tree of \(G\). Which ONE of the given options is CORRECT for every such graph \(G\) ?

  1. A.

    The height of \(T\) is exactly 15.

  2. B.

    The height of \(T\) is exactly 30.

  3. C.

    The height of \(T\) is at least 15.

  4. D.

    The height of \(T\) is at least 30.

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Correct answer: C

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