A singly linked list holds the values 4, 9, 16, 25 in that order. HEAD references the first node. Each node has fields DATA and NEXT, and the last node's NEXT is NULL.
CURRENT = HEAD
COUNT = 0
loop while CURRENT.NEXT ≠ NULL
COUNT = COUNT + 1
CURRENT = CURRENT.NEXT
end loop
output COUNT, CURRENT.DATA
What is output?