Consider the following C program, which writes a sequence of numbers to a file named “output.txt”. In the answer box below, carefully write the exact contents of “output.txt” after executing the program.

#include <stdio.h>
int main() {
    FILE *file = fopen("output.txt", "w");
    if (file != NULL) {
        for (int i = 1; i/2 <= 2; i++) {
            fprintf(file, "%d,", i);
        }
        fclose(file);
    }
    return 0;
}