Consider the following fragment of code. If you were to use this function in a threaded

scenario, what portion of it would be the critical section? Try to minimize the size of the

critical section given the options provided.

struct Book $\{$

char$*$ title;

char$*$ user$\_$name;

int is checked$\_$out;

$\}$

void check$\_$out$($char$*$ userName, int bookID, Book$*$ books$)\{$

char$*$ user$\_$name $-($chan$*)$malloc$($sizeof$($char$)*255)$;

strcpy$($user$\_$name, userName$)$;

Book$*\_$book $=$ &books $[$bookID$]$;

if$(!$book$->$is$\_$checked$\_$out$)\{$

book$->$is checked out $=1$;

book$->$user$\_$name $=$ user$\_$name;

books $[$bookID$]=$ book;

$\}$

$\}$

Choices:

$11-15$

$7-15$

$10-15$

$7-8$

Or The function is thread safe and does not need a critical section