The reverse method is defined in this section. What is list1 after executing the following statements?

```
int[] list1 = {1, 2, 3, 4, 5, 6};
int[] list2 = reverse(list1);
```
a. list1 is 1 2 3 4 5 6
b. list1 is 6 5 4 3 2 1
c. list1 is 0 0 0 0 0 0
d. list1 is 6 6 6 6 6 6

a