9. What will be the output of the following program? #include int main() int x 6; int *px; px &x; *px - 12: printf("%d ",x); return 0; } A 12 B 6 C. 0 D. The program will return error 10. What is the output of the following program? #include main } void f printf("Hello"n"); } A. No output B. Hello C. Error, as the main() function is left empty D. Error, as the function is defined without its declaration