Graph quiz question #4

#1

option 1 2 3 are correct but it says only option 1 is correct why??

#2

mistake option 2 is correct why??

#3

@neelesh_garg,
Are you talking about the question mentioned below?

Union By Rank

If we use trees with the union-by-rank algorithm, what is the worst case running time for checking if two elements are in same set or not?

#4

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