Select the code you want to add to this program on C code to calculate the sum of the 3x3 matrix elements. #include int main() { int matrix[3][3] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}; int sum = 0; // Put answer code here printf("The sum of all elements is: %d ", sum); return 0; }

Question

Select the code you want to add to this program on C code to calculate the sum of the 3x3 matrix elements. 
 #include <stdio.h> int main() {     int matrix[3][3] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};     int sum = 0;         // Put answer code here         printf("The sum of all elements is: %d
", sum);     return 0; }

Answer

sum = matrix[0][0] + matrix[1][1] + matrix[2][2];

Answer

sum = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9;

Answer

for (int i = 1; i <= 3; i++) {     for (int j = 1; j <= 3; j++) {         sum += matrix[i][j];     } }

Answer

for (int i = 0; i < 3; i++) {     for (int j = 0; j < 3; j++) {         sum += matrix[i][j];     } }

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