Let the head is doubly linked list, what is the following function do$?$A$)$ returns the number of items from the beginning of the linked list to the head nodeB$)$ returns the number of items in the linked listQ. returns the half number of items in the linked listD$)$ returns the number of items in the part of the linked list from the head that exceeds the other part by $1$E$)$ None of these