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Let G be a weighted connected graph 2 . 5 I. If the edge weights are all different G must have exactly one MST II

Let G be a weighted connected graph 2.5
I. If the edge weights are all different G must have exactly one MST
II. If the edge weights are not all different G must have more than one MST
III. If the edge weights are all same, every spanning tree of G is a MST
Which one of the following is correct
[ A ] I is true, II and III are false
[ B ] I and III are true but II is false
[ C ] I and II and III are true
[ D ] I and II and III are false
[ E ] II is true but I and III are false

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