(A) (u, v) where v is an ancestor of u in the tree
(B) (u, v) where u is an ancestor of v in the tree
(C) (u, v) where v is predecessor of u in the tree
(D) None of the given
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(A) (u, v) where v is an ancestor of u in the tree
(B) (u, v) where u is an ancestor of v in the tree
(C) (u, v) where v is predecessor of u in the tree
(D) None of the given