Is the following Python code valid?
>>> a=frozenset([5,6,7])
>>> a
>>> a.add(5)
>>> a=frozenset([5,6,7])
>>> a
>>> a.add(5)A. Yes, now a is {5,5,6,7}
B. No, frozen set is immutable
C. No, invalid syntax for add method
D. Yes, now a is {5,6,7}
Answer: Option B

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