Which of the following conditions will enable this append method in the LinkedList to perform its task?

def append$($self$,$ value$)$:

if $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$:

self.tail.next $=$ Node$($value$)$

self.tail$=$self.tail.next

else:

self.add$($value$)$

Group of answer choices

self.tail is None

self.tail.next is None

self.tail.next is not None

self.tail is not None