URGENT: please suggest the answer with explanation

[himasagar7]

what is the most appropriate option for the code snippet below

Class myint{
Public:
myint(int value):m_int(int value){}
myint &operator++()
{
++m_int;
return * this;
}
myint operator++(int)
{
myint tmp(*this);
++m_int;
return tmp;
}
Private :int m_int;

Q)For ++ operator overloaded in the class myint

1.Prefix implementation is more efficient than postfix
2.postfix implementation is more efficient than prefix
3. Both prefix and post fix are efficient
4. None of these