A doorknob is an example of a:
D. Wheel and Axle.
I hope this helped ^_^
Answer:
3
Explanation:
Heap sort pick an item from the first or last position in an array and compares it with other items in other positions in the array, swapping position if they meet the condition.
The array above has three maximum items arranged sequentially in the array, this is prove that there have been 3 reheapifications in the array.
Accurate and relevant information , a quick process