What will be the output of the following C code?#include

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What will be the output of the following C code?

#include <stdio.h>
    typedef struct B
    {
        int n1, n2;
    };
    int main()
    {
        B k = {10, 20};
        printf("%d\n", k.n1);
    }

1. 10
2. 20
3. Compilation Error
4. Undefined behaviour
5. None of these

Correct Option: C

Compilation Error

main.c:5:5: warning: useless storage class specifier in empty declaration
     };
     ^
main.c: In function ‘main’:
main.c:8:9: error: unknown type name ‘B’; use ‘struct’ keyword to refer to the type
         B k = {10, 20};
         ^
         struct 
main.c:8:20: warning: excess elements in scalar initializer
         B k = {10, 20};
                    ^~
main.c:8:20: note: (near initialization for ‘k’)
main.c:9:25: error: request for member ‘n1’ in something not a structure or union
         printf("%d\n", k.n1);