Consider the code snippet below, which uses the base$-$class Question and the derived class ChoiceQuestion:

Question$*$ quiz$[2]$;

quiz$[0]=$ new Question;

quiz$[0]->$set$\_$text$("$Who was the inventor of C$++?")$;

quiz$[0]->$set$\_$answer$("$Bjarne Stroustrup"$)$;

ChoiceQuestion$*$ cq$\_$pointer $=$ new ChoiceQuestion;

cq$\_$pointer$->$set$\_$text$("$In which country was the inventor of C$++$ born?"$)$;

cq$\_$pointer$->$add$\_$choice$("$Australia$",$ false$)$;

$...$

quiz$[1]=$ cq$\_$pointer;

Why is the last line of code not a type mismatch?