Study the code and select the correct output:

#include

#include

#include

void printDeque$($std::deque& dq$)\{$

if $($dq$.$empty$())\{$

throw std::runtime$\_$error$("$Deque is empty, cannot access elements."$)$;

$\}$

for $($int &elem : dq$)\{$

std::cout $<<$ elem $<<""$;

$\}$

std::cout $<<$ std::endl;

$\}$

int main$()\{$

try $\{$

$//$ Create a deque of integers

std::deque dq;

$//$ Add elements to the back and front

dq$.$push$\_$back$(5)$;

dq$.$push$\_$back$(10)$;

dq$.$push$\_$front$(2)$;

dq$.$push$\_$front$(1)$;

printDeque$($dq$)$;

std::cout $<<$ std::endl;

$//$ Modify elements using iterators

for $($auto it $=$ dq$.$begin$()$; it $!=$ dq$.$end$()$; $++$it$)\{$

$*$it $+=5$; $//$ Increment each element by $5$

$\}$

printDeque$($dq$)$;

std::cout $<<$ std::endl;

$//$ Remove elements from the deque

dq$.$pop$\_$front$()$;

dq$.$pop$\_$back$()$;

dq$.$pop$\_$back$()$;

dq$.$pop$\_$front$()$;

printDeque$($dq$)$;

std::cout $<<$ std::endl;

$\}$

catch $($const std::exception& e$)\{$

std::cerr $<<$ "Exception: $"<<$ e$.$what$()<<$ std::endl;

$\}$

return $0$;

$\}$

a$.$

$12510$

$671015$

Exception: Deque is empty, cannot access elements.

b$.$

Exception: Deque is empty, cannot access elements.

$12510$

$671015$

Exception: Deque is empty, cannot access elements.

c$.$

deque empty before pop

$12510$

$671015$

d$.$

Error message $-$ you cannot print a deque