Which of the Following Statements A), B) or C) Is

Which of the following statements a) , b) or c) is false?

A) Sets are immutable, so sets can have other sets as elements.
B) A frozenset is an xe "immutable:frozenset type"immutable set-it cannot be modified after you create it, so a set can contain frozensets as elements.
C) The built-in function frozenset creates a frozenset from any iterable.
D) All of the above statements are true.