Q. Consider the following iterative implementation used to find the length of a linked list:
struct Node{
  int val;
  struct Node *next;
}*head;
int get_len(){
  struct Node *temp = head->next;
  int len = 0;
  while(_____){
   len++;
   temp = temp->next;
  }
  return len;
}
Which of the following conditions should be checked to complete the above code?

• temp->next != 0
• temp == 0
• temp != 0
• temp->next == 0

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