Quick question about returning from a nested statement

bool b;

public bool ifelse(int i)
{
if(i == 5)
{
b = true;
}

else
{
b = false;
}
return b;
}

public bool ifelse(int i)
{
    if(i == 5)
    {
        return true;
    }
    else
    {
        return false;
    }
}

return i == 5;

public bool ifelse(int i)
{
if(i == 5)
{
return true
}
return false
}

public bool ifelse(int i)
{
  bool b;
  /*
  Some code to calculate b
  */
  return b;
}