What is the purpose of the CQL language in Cassandra?
A. To define the schema of tables in Cassandra
B. To query data in Cassandra
C. To insert data into tables in Cassandra
D. All of the above
Answer: D
Explanation: The CQL language in Cassandra is used to define the schema of tables in Cassandra, query data in Cassandra, and insert data into tables in Cassandra.
