Question $1$

Which line$($s$)$ if any might crash when calling these functions in a multi$-$threaded program?if $($iter$)\{$ lock$($&mutex$)$; unlock$($&mutex$)$;$\}$

$\}$

void$*$ iter$\_$get$($iter$\_$t$*$ iter$)\{$ if $($iter$->$curr$)\{\}$return NULL;

$\}$Lines $3$ & $12$

Line $3$

Line $5$

Line $13$

Lines $5$ & $13$

Lines $12$ & $13$

No crashes