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Regarding implementation of Depth First Search using stacks, what is the maximum distance between two nodes present in the stack? (considering each edge length 1)

(a) Can be anything

(b) 0

(c) At most 1

(d) Insufficient Information

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The correct option is (a) Can be anything

The best I can explain: In the stack, at a time, there can be nodes which can differ in many levels. So, it can be the maximum distance between two nodes in the graph.

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