: pushl %ebp movl %esp, %ebp pushl %ebx movl $12(%esp), %ecx addl %ecx, %ecx movl %ecx, %eax popl %ebx leave ret 

Which of the assembly code fragments below are equivalent to the above code fragment for IA-32?

1. : pushl %ebp movl %esp, %ebp pushl %ebx movl $12(%esp), %ebx addl %ebx, %ebx movl %ebx, %eax popl %ebx leave ret 

2. : pushl %ebp movl %esp, %ebp pushl %ebx movl $12(%esp), %eax addl %eax, %eax popl %ebx leave ret 

3. : pushl %ebp movl %esp, %ebp pushl %ebx movl $12(%esp), %esi addl %esi, %esi movl %esi, %eax popl %ebx leave ret 

4. : pushl %ebp movl %esp, %ebp pushl %ebx movl $12(%esp), %edi addl %edi, %edi movl %edi, %eax popl %ebx leave ret