(A) There is Null pointer at the end of list
(B) The Isolated vertex is not handled in list
(C) Only one value is entered in the list
(D) There is at least one null list
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(A) There is Null pointer at the end of list
(B) The Isolated vertex is not handled in list
(C) Only one value is entered in the list
(D) There is at least one null list