DynamoDB supports two types of Primary Keys. What is the fundamental difference between a 'Simple' and a 'Composite' primary key?

1. A A simple key uses a timestamp, while a composite key uses a random UUID.
2. B A composite key consists of a 'Partition Key' and a 'Sort Key', enabling one-to-many relationships and range queries within a partition.
3. C A simple key is for reads, and a composite key is required for writes.
4. D A composite key is only used when the data size exceeds 100GB.