Examine the following code. State what line $1$ does, and state the outputs of lines $2$

and $3.$

include

#include

using namespace std;

class Container$\{$

private:

vector A;

public:

Container$($const int size,int$*$ array$)\{$

for $($unsigned int i $=0$; i $<$ size; i$++)$

A$.$push$\_$back$(*($array$++))$;

$\}$;

int operator$[]($int index$)\{$ return A$[$index$]*$ A$[$index$]$;

$\}$

int operator$++()\{$return $5*$ A$[2]$; $\}$

$\}$;

int main$()\{$

const int ksize $=3$;

int array$[$ksize$]=\{2,3,4\}$;

Container A$($ksize$,$array$)$; $//$ Line $1$

cout $<<$ A$[1]<<$ endl; $//$ Line $2$

cout $<<++$A $<<$ endl; $//$ Line $3$

$\}$

$3$

$2$

$2$

c$)$ When dealing with vectors, explain the difference between the functions size$()$

and capacity$()$