If P calls G(x, y), then which of the following statements below are correct ?

1. Arguments passed to G are stored in G's stack frame.

2. Return address to P is stored in P's stack frame.

3. G can safely overwrite %eax, %edx or %ecx without saving their data first.

4. G can safely overwrite %ebx, %esi or %edi without saving their data first.