Which statement is true about migration?

In a bottom-up migration you begin with the low-level utility JARs and work upward, converting each to a real module until the entire codebase resides on the module path. Consequently, every module is ultimately moved to the module path, eliminating the class path.

A Top-down migrates only the application-level module(s); dependencies may remain on the class path. C Order described is bottom-up, not top-down. D JARs on the class path are unnamed modules, never “automatic modules.”

1. Oracle JDK 17 Migration Guide, “Strategies for Migrating to Modules – Bottom-Up vs Top-Down” (https://docs.oracle.com/en/java/javase/17/migrate/strategies-jpms.html)

2. University of Helsinki, “Advanced Java – Module System”, lecture notes §5 “Migration Approaches” (https://link.springer.com/chapter/10.1007/978-3-030-75719-15)