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

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

A) Like operator |, union augmented assignment |= performs a set union operation, but |= doesn't modify its left operand.
B) The set type's update method performs a union operation modifying the set on which it's called-the argument can be any iterable.
C) Other mutable set methods are xe "intersection augmented assignment"intersection augmented assignment xe "&= set intersection augmented assignment"&=, xe "difference augmented assignment (sets) "difference augmented assignment xe "-= set difference augmented assignment"-= and xe "symmetric difference augmented assignment"symmetric difference augmented assignment xe "^= set symmetric difference augmented assignment"^=. Their corresponding methods with iterable arguments are xe "set built-in type:intersection_update"xe "intersection_update method of set"intersection_update, xe "set built-in type:difference_update"xe "difference_update method of set"difference_update and xe "set built-in type:symmetric_difference_update"xe "symmetric_difference_update method of set"symmetric_difference_update.
D) All of the above statements are true.