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The cqlsh COPY command is the correct tool for exporting data from Cassandra. This command is part of the Cassandra Query Language Shell (cqlsh) and allows users to import and export data to and from CSV (Comma-Separated Values) files. The COPY command is particularly useful because it provides a straightforward way to handle data directly from the command line without the need for complex setups or additional software.

When using the COPY command, users can specify various options such as the keyspace and table from which to export data and the filename for the output CSV file. This simplicity and direct integration with Cassandra make it an effective choice for data export tasks.

While other tools like Apache Flink, Informatica, and MySQL Workbench are powerful in their own contexts, they are not designed specifically for interacting with Cassandra in terms of exporting data. Apache Flink is primarily used for stream processing, Informatica is an ETL (Extract, Transform, Load) tool that may work with various databases but does not specifically facilitate a direct and simple export from Cassandra, and MySQL Workbench is primarily tailored for MySQL databases, making it incompatible with Cassandra's architecture.