Consider the following piece of code. (The numbers on the left margin denote line numbers.) line# 01 class LL_node { 02 int val; 03 LL_node next; 04 public LL_node (int n) { 05 val = n; 06 next =...

Consider the following piece of code. (The numbers on the left margin denote line numbers.)

line#
01 class LL_node {
02     int val;
03     LL_node next;
04     public LL_node (int n) {
05         val = n;
06         next = null;
07     }
08     public void set_next (LL_node nextNode) {
09         next = nextNode;
10     }
11     public LL_node get_next () {
12         return next;
13     }
14     public void set_value (int input) {
15         val = input;
16     }
17     public int get_value () {
18         return val;
19     }
20 }
21 public class LL {
22     protected LL_node head;
23     protected LL_node tail;
24     public LL () {
25         head = null;
26         tail = null;
27     }
28     public int append (int n) {
29         if (head == null) {
30             head = new LL_node(n);
31             tail = head;
32         } else {
33             LL_node new_node;
34             new_node = new LL_node(n);
35             tail.set_next (new_node);
36             tail = new_node;
37         }
38         return n;
39     }
40 }

Out of the following, tick the true statements and leave the false statements unticked.
(More than one of the statements could be true. You get full marks only for marking all the statements correctly. There are no partial marks.)