What will be the output of the following program?#include<stdio.h> int X=40; int main() {     int X=20;     printf("%d", X);     return 0; }Select one:400Error20

The output of the program will be 20.

Here's the step by step explanation:

1. The program starts with the inclusion of the standard input/output library in C, #include<stdio.h>.

2. Then, a global variable X is declared and initialized with the value 40.

3. The main() function is defined. This is the entry point of the program.

4. Inside the main() function, a local variable X is declared and initialized with the value 20. This local variable X is different from the global variable X. The scope of this local X is within the main() function only.

5. The printf() function is called to print the value of X. Since the local variable X is in scope, its value (20) is printed.

6. The main() function returns 0, indicating successful termination of the program.

So, the correct answer is 20.