Question: How does `defaultdict` work?

1. `defaultdict` will automatically create a dictionary for you that has keys which are the integers 0-10.
2. `defaultdict` forces a dictionary to only accept keys that are of the types specified when you created the `defaultdict` (such as strings or integers).
3. If you try to read from a `defaultdict` with a nonexistent key, a new default key-value pair will be created for you instead of throwing a `KeyError`.
4. `defaultdict` stores a copy of a dictionary in memory that you can default to if the original gets unintentionally modified.

Answer: The correct answer of the above question is Option C:If you try to read from a `defaultdict` with a nonexistent key, a new default key-value pair will be created for you instead of throwing a `KeyError`.