In a binary search tree, which of the following traversals would print the numbers in the ascending order?

(a) Level-order traversal

(b) Pre-order traversal

(c) Post-order traversal

(d) In-order traversal

I would like to ask this question from Inorder Traversal topic in section Binary Trees of Data Structures & Algorithms I

I had been asked this question by my school principal while I was bunking the class.