What will be the output of the following C code? #include<stdio.h> int main(){ register static int i = 10; i = 11; printf("%d\n", i); return 0; }

What will be the output of the following C code?

#include<stdio.h>
int main(){
    register static int i = 10;
    i = 11;
    printf("%d\n", i);
    return 0;
}

1. a) 10
2. b) Compile-time error
3. c) Undefined behavior
4. d) 11