Which of the following best describes a key difference between a traditional Relational Database Management System (RDBMS) and a NoSQL database?A) NoSQL databases do not require a data schema to be defined upfront, allowing for greater flexibility in data modeling.B) RDBMS systems are faster and more efficient than NoSQL databases for handling large amounts of unstructured data.C) NoSQL databases support only simple, one-to-one relationships between tables, while RDBMS systems can handle more complex relationships.D) RDBMS systems offer better data security and transactional consistency than NoSQL databases.

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