Which of the following are considered constant-time operations when analyzing an algorithm’s time complexity with respect to a problem size n? (Select all that apply)Multiple choice

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Suppose we have a recursive function defined on a binary tree. The function takes as input a node in the tree, calls another function bar that performs some work on the node and then makes recursive calls to itself on the left and right subtrees provided they are not empty. def foo(u):     bar(u)     if u.left is not empty then         foo(u.left)     if u.right is not empty then         foo(u.right)   Suppose bar(u) takes O(|subtree(u)|) time to execute, where |subtree(u)| is the size of the subtree rooted at u. What is the time complexity of running foo from the root a tree with n nodes. Select the tightest bound that holds.

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