Consider the following statement:

my$\_$obj$->$myfun$()$;

Which of the following statements are true?

I. my$\_$obj must be a pointer to an object.

II$.$ myfun$()$ must be a virtual function.

III. It cannot be determined from this statement alone which function myfun$()$ will actually be exacuted if it is part of an inheritance hierarchy.

$$ I, II$,$ III

II$,$ III

I, III

$1,$ II