Which of the following code snippets will count down from 10 to 1?

1.for (int i = 10; i >= 0; i--)

cout << i << " ";

2.for (int i = 1; i < 10; i++)

cout << i << " ";

3.for (int i = 10; i > 0; i--)

cout << i << " ";

4.for (int i = 1; i <= 10; i++)

cout << i << " ";

could you plz provide the code so that I can understand better.