Which of the following statements are true about this code? (Mark all that apply)

void main() { int x; unsigned int i; for ( i = 0 ; i >= 0 ; ) { x = (++i); } return; }

1. For Loop never exits

2. For Loop never enters

3. The variable i will overflow

4. The variable x will overflow

5. The pre-increment on i will not work

6. The keyword unsigned is not a C-keyword