Which of the following statements is false?

a. A set is an unordered collection of unique values.
b. Sets may contain only immutable objects, like strings, ints, floats and tu-ples that contain only immutable elements.
c. Sets are iterable, so they are sequences and they support indexing and slicing with square brackets, [].
d. Dictionaries do not support slicing.

c. Sets are iterable, so they are sequences and they support indexing and slicing with square brackets, [].