Which of the following statements are correct about the

Which of the following statements are correct about the following program?

#include <stdio.h>
int main ( )
{
       int a = 20, b = 30;
       if (a % 2 = b % 3)
             printf ("\n Carpathians");
       return 0;
}

1. Error : 'Expression syntax'
2. Error : 'L value required'
3. Error : 'R value required'
4. The code runs successfully.

= must have L value
Error : 'L value required'