Select the components on a host that are monitored by OneAgent.

OneAgent is a comprehensive monitoring agent designed to provide deep insights into the performance of the applications running on a host. It monitors a wide range of system metrics essential for performance analysis and troubleshooting. The correct choice reflects that OneAgent can monitor multiple components on a host, including the Disk, Network Interface Controller (NIC), CPU, and Memory, which are crucial for understanding overall system performance and resource utilization.

Monitoring these components allows Dynatrace to gather detailed performance metrics that are essential for diagnosing issues, optimizing resource allocation, and ensuring that applications are running smoothly. By tracking CPU usage, for instance, OneAgent can help identify bottlenecks in processing power, while monitoring Memory helps in assessing how much RAM is being utilized and whether there are any potential memory leaks. Similarly, observing Disk performance can reveal slow read/write operations, and monitoring the NIC helps in understanding network throughput and potential connectivity issues.

This broad spectrum of monitoring is vital for maintaining robust application performance and providing actionable insights, which is why the inclusion of all these components makes this answer the best choice.