Question: 3 1 . After 3 9 is added into the following AVL tree, it is no longer balanced. What rotation should be performed to restore

31. After 39 is added into the following AVL tree, it is no longer balanced.
What rotation should be performed to restore the AVL tree?
single left rotation at 37
single left rotation at node 38
double rotation: right rotation at 43, followed by left rotation at 38
double rotation: left rotation at 38, followed by right rotation at 37
31. After 39 is added into the following AVL tree, it

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