Question: A BST is formed from the given sequence 6, 9, 1, 2, 7, 14, 12, 3, 8 and 18. The minimum number of nodes required

A BST is formed from the given sequence 6, 9, 1, 2, 7, 14, 12, 3, 8 and 18. The minimum number of nodes required to be added into this tree to form an extended binary tree is?

A. 3 

B. 6 

C. 8 

D. 11

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