How does Ruby's Garbage Collector (GC) generally manage memory, particularly with the "generational" GC introduced in later MRI versions?

A Objects must be manually freed using free() B MRI uses a generational, incremental garbage collector that treats newly created ("young") objects differently from long-lived ("old") objects, scanning young objects more frequently to improve performance C Ruby has no garbage collector and relies on the OS D GC runs only when the program exits