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What will be the best case time complexity of merge sort?

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in Data Structures & Algorithms II by (111k points)
What will be the best case time complexity of merge sort?

(a) O(n log n)

(b) O(n^2)

(c) O(n^2 log n)

(d) O(n log n^2)

I had been asked this question during an internship interview.

The doubt is from Sorting in portion Sorting of Data Structures & Algorithms II

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Correct answer is (a) O(n log n)

For explanation: The time complexity of merge sort is not affected in any case as its algorithm has to implement the same number of steps. So its time complexity remains to be O(n log n) even in the best case.

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