What will this program output?

“`C++
#include

class Matrix {
public:
Matrix(int rows, int cols) : rows(rows), cols(cols) {
data = new int*[rows];
for (int i = 0; i < rows; ++i) { data[i] = new int[cols]; for (int j = 0; j < cols; ++j) { data[i][j] = i * cols + j + 1; } } } ~Matrix() { for (int i = 0; i < rows; ++i) { delete[] data[i]; } delete[] data; } void print() const { for (int i = 0; i < rows; ++i) { for (int j = 0; j < cols; ++j) { std::cout << data[i][j] << " "; } std::cout << std::endl; } } private: int** data; int rows; int cols; }; int main() { Matrix matrix(3, 4); matrix.print(); return 0; } ```