In the following code, what is the first line that introduces a memory leak into the program? (Type the line number into the box below.)

1: #include 2: #include 3: 4: int main(void) 5: { 6: int *numbers1 = NULL; 7: int *numbers2; 8: 9: numbers1 = malloc(sizeof(int)); 10: numbers2 = malloc(sizeof(int) * 12); 11: 12: *numbers1 = 0; 13: numbers2 = numbers1; 14: numbers1 = malloc(sizeof(int) * 40); 15: 16: return 0; 17: }