(10%) Please show the level of the binary search tree which constructed from given preorder traversal. The preorder traversal: 50, 15, 11, 3, 2, 22, 84, 80, 77, 90, 95.

Note: In a tree, each step from top to bottom is called as level of a tree. The level count starts with 1 and increments by 1 at each level or step.