Use a few sentences to explain the program segments below:

a$)$ arr is a list of integers $(2,3,4,5,...,98,99,100).$ brr is an empty list. What does the following code accomplish?

while $(!$arr.isEmpty$())\{$

int front $=$ arr.remove$(0)$;

brr$.$add$($front$)$;

Iterator itr $=$ arr.iterator$()$;

while $($itr$.$hasNext$())\{$

int current $=$ itr.next$()$;

if $($current $\%$ front $==0)\{$

itr.remove$()$;

$\}$

$\}$

$\}$