Given the following C$++$ class, what will be the output when the following main function is executed?

class Box $\{$

int width, height;

public:

Box$($int w$,$ int h$)$ : width$($w$),$ height$($h$)\{\}$

int area$()\{$ return width $*$ height; $\}$

$\}$;

int main$()\{$

Box box$1(3,4),$ box$2(5,6)$;

cout $<<$ box$1.$area$()+$ box$2.$area$()$;

return $0$;

$\}$

Given the following C$++$ class, what will be the output when the following main function is executed?

class Box $\{$

int width, height;

public:

Box$($int w$,$ int h$)$ : width$($w$),$ height$($h$)\{\}$

int area$()\{$ return width $*$ height; $\}$

$\}$;

int main$()\{$

Box box$1(3,4),$ box$2(5,6)$;

cout $<<$ box$1.$area$()+$ box$2.$area$()$;

return $0$;

$\}$

Compilation Error

$30$

$18$

$42$