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 = 4, k = 1;
        do {
            num = num++;
            k++;
        } while (k != 4);
        printf("%d\n", num);
    }

1. 1
2. Undefined behaviour
3. 2
4. 3
5. 4

Correct Option: E

4