Final answer:
Cassandra indeed supports data transfer from RDBMS to Cassandra, making the statement true.
Step-by-step explanation:
Cassandra does support data transfer from RDBMS systems in and out of Cassandra. So, the statement is true. Tools like Apache Sqoop can be used to facilitate this transfer, enabling the migration of data from traditional relational databases to Cassandra, which is a NoSQL database designed to handle large amounts of data across many commodity servers. This capability is essential for organizations looking to leverage the scalability and high availability of Cassandra without losing the valuable data they have stored in existing RDBMS systems.