Q: What are the differences between HashMap and HashTable in Java?

A HashMap allows null values and is not synchronized, while HashTable does not allow null values and is synchronized.
B HashTable allows null values and is not synchronized, while HashMap does not allow null values and is synchronized.
C Both HashMap and HashTable allow null values, but HashMap is not synchronized while HashTable is synchronized.
D Both HashMap and HashTable do not allow null values, but HashMap is synchronized while HashTable is not synchronized.
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