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>
    int main()
    {
        int num[5] = {11, 21, 31, 41, 51};
        int ptr[5];
        ptr = num;
        printf("%d\n", ptr[2]);
    }

1. Undefined behaviour
2. Garbage value
3. Compilation Error
4. 51
5. None of these

Correct Option: C

Compilation Error

main.c: In function ‘main’:
main.c:6:13: error: assignment to expression with array type
         ptr = num;