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>
    struct Employee
    {
        char str[];
    };
    void main()
    {
        struct Employee Emp;
        printf("%d", sizeof(struct Employee));
    }

1. Garbage value
2. Undefined behaveiour
3. Nothing
4. Size of char
5. Compilation Error

Correct Option: E

Compilation Error

main.c:4:14: error: flexible array member in a struct with no named members
         char str[];