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What is the time complexity of the above code used to reverse a string?

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in Data Structures & Algorithms II by (89.2k points)
What is the time complexity of the above code used to reverse a string?

(a) O(1)

(b) O(n)

(c) O(n^2)

(d) O(n^3)

This question was addressed to me in examination.

Question is taken from String Reversal using Recursion in portion Recursion of Data Structures & Algorithms II

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Correct choice is (b) O(n)

The best explanation: The time complexity of the above code used to reverse a string is O(n).

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