Question: When considering time complexity, what is the average case for MergeSort and why? Group of answer choices n log n because the algorithm runs iteratively

When considering time complexity, what is the average case for MergeSort and why?
Group of answer choices
n log n because the algorithm runs iteratively (n-1) times
n log n because the algorithm continually splits the array in half and runs n times
n2 because the algorithm has a nested loop
n2 because the algorithm runs over the entire array twice

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