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What is the output of the following code? #include using namespace std; void f1(int x, int &y, int *z) { x++; y++; (*z)++; } int main() { int i = 1, j = 1, k = 1; f1(i, j, &k); cout << "i is " << i; cout << " j is " << j; cout << " k is " << k << endl; return 0; }