Which among the following is correct for multiple inheritance?

class student$\{$public: int marks;$\}$s; class stream$\{$int total;$\}$; class topper:public student, public stream$\{\}$;

class student$\{$int marks;$\}$; class stream$\{\}$; class topper: public student$\{\}$;

class student$\{$int marks;$\}$; class stream:public student$\{\}$;

class student$\{\}$; class stream$\{\}$; class topper$\{\}$;