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What is the cut-off for switching from quick sort to heap sort in the implementation of introsort?

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What is the cut-off for switching from quick sort to heap sort in the implementation of introsort?

(a) 16

(b) n^2

(c) n log(n)

(d) 2 log (n)

I have been asked this question in quiz.

My question is taken from Sorting topic in chapter Sorting of Data Structures & Algorithms II

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Correct answer is (d) 2 log (n)

Easy explanation - Quicksort has a worst case time complexity of O(n^2) which is not preferable. So in order to avoid worst case of quicksort, introsort switches to heap sort when the depth is greater than 2 log(n). This particular value has been deduced experimentally.

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