What is the total number of activation records to be pushed onto (and eventually popped off) the run-time stack if we apply mergesort to sort the 5 elements 1,2,3,4,5. What is the total number of activation records to be pushed onto (and eventually popped off) the run-time stack if we apply quicksort to sort the 5 elements 1,2,3,4,5. What is the maximum number of activation records on the run-time stack (the maximum height of the stack) if we apply mergesort to sort the 5 elements 1,2,3,4,5