In the following program where is the variable a getting defined and where it is getting declared? #include int main() { extern int a; printf("%d\n", a); return 0; } int a=20;

• extern int a is declaration, int a = 20 is the definition
• int a = 20 is declaration, extern int a is the definition
• int a = 20 is definition, a is not defined
• a is declared, a is not defined