What does the JVM argument XX:+UseG1GC indicate?

The argument XX:+UseG1GC is specifically used to configure the Java Virtual Machine (JVM) to utilize the G1 Garbage Collector (G1 GC). G1 GC is designed to handle applications with large heaps and aims to minimize pause times by breaking the heap into regions and collecting garbage in a way that can deliver a balance between throughput and latency.

When this argument is passed during the JVM startup, it instructs the JVM to replace the default garbage collection mechanism with G1 GC, thus optimizing memory management in environments where performance and responsiveness are critical.

This choice distinctly highlights the purpose of the argument, as it directly correlates with enabling the G1 GC functionality. Other options do not accurately describe what the XX:+UseG1GC argument achieves, which reinforces why this is the correct answer.