What is the best-case and worst-case complexity of searching for an element in an unbalanced BST? Assume N to be the number of nodes in the BST.单项选择题

A

a. Best O(logN) | Worst: O(logN)

B

b. Best O(1) | Worst: O(N)

C

c. Best O(logN) | Worst: O(N)

D

d. Best: O(1) | Worst: O(logN)

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