Consider the code snippet below:

$```$

class ChoiceQuestion : public Question

$\{$

public:

void display$()$ override;

$\}$;

$```$

What is the meaning of the override in the last line?

I. It forces this function to override Question: : display$().$

II$.$ It indicates this function should override Question: : display$(),$ and will cause a compiler error if it does not.

III. It is a syntax error in some compilers.I onlyII onlyIII onlyII and III