1. In the standard library of C programming language, which of the following header file is designed for Standard I/O printf(/scanf() function? A B. C. D. math.h conio.h dos.h stdio.h 2. In the given below statement, what does the *ptr" indicate? float *ptr; A. ptr is a pointer, which data type is float B. ptr is a pointer C. ptr is a function pointer D. None of the above 3. What is the output of the following program? #include main() { int x = 8; int *ptr; ptr=&x; printf("%d", *ptr); } A. B. C. D. Compile error 8 9 Garbage value