What is the output of the following code? #include <iostream> 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; }

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