Consider a C$++$ program which tries to remove duplicate elements in an array arr. It has a function with a prototype of void remove$\_$duplicates $($int arr$[],$ int &n$)$;$,$ with

being the number of elements of arr. For example, let int arr$[6]=\{3,6,7,7,7,9\}$;$,$ then the expected array is $[3,6,7,9].$

Say a student implements such function as follows:

$1.$ void remove$\_$duplicates $($int arr$[],$ int &n$)\{$

$2.$ int index $=0$;

$3.$ for $($int i $=1$; i $<$ n; i$++)\{$

$4.$ int j $=0$;

$5.$ while $($j $<=$ index && arr$[$j$]!=$ arr$[$i$])$

$6.$ j$++$;

$7.$ if $($j $>$ index$)$

$8.$ arr$[$index$++]=$ arr$[$i$]$;

$9.\}$

$10.$ n $=$ index $+1$;

$11.\}$

Does this function do the job? If not, which line of code has errors $($considering any type of error$)?$

Group of answer choices

Line $6$

Line $8$

There are no errors.

Line $3$

Line $5$

Line $7$

Line $10$

Line $2$