What does "nodetool" provide for Cassandra?

"nodetool" is a command-line utility that comes with Apache Cassandra and is essential for managing and administering a Cassandra cluster. It provides several administrative functions, allowing users to perform tasks such as monitoring the status of nodes, updating configuration settings, gathering statistics about the cluster's performance, and managing data. For instance, users can use "nodetool" to check the health of nodes, perform repairs, and manage snapshots, among other tasks crucial for maintaining the operational integrity of a Cassandra database.

The other options do not accurately describe the primary purpose of "nodetool." Application development or connection to other databases pertains to different tools and libraries rather than the administrative focus of "nodetool." Similarly, while monitoring is part of what can be achieved with this tool, it is not a graphical interface but rather a command-line based one. Thus, the primary function of "nodetool" is accurately encapsulated in the choice related to cluster management.