What is the output of the following code?
```
#include
using namespace std;
int main()
{
int matrix[4][4] =
{{1, 2, 3, 4},
{4, 5, 6, 7},
{8, 9, 10, 11},
{12, 13, 14, 15}};
int sum = 0;
for (int i = 0; i < 4; i++)
cout << matrix[i][1] << " ";
return 0;
}
```
a. 1 3 8 12
b. 3 6 10 14
c. 4 5 6 7
d. 1 2 3 4
e. 2 5 9 13
e. 2 5 9 13
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