Write a function that sums all the integers in a matrix of integers using the following header: const int SIZE = 4; double sumMatrix(const double m[] [SIZE], int columnSize); Solution #include <iostream> using namespace std; const int SIZE = 4; int sum(const int a[][SIZE], int columnSize) { int total = 0; for (int row = 0; row <SIZE ; row++) { for (int column = 0; column < columnSize; column++) { total += a[row][column]; } } return total; } int main() { int m[4][4]= { {1,2,3,4}, {5,6,7,8}, {9,10,11,12}, {13,14,15,16} }; cout<< \"Sum of elements of the matrix :\"<< sum(m,4) << endl; system(\"pause\"); return 0; } .