What action in upgrade planning correctly describes linking environments?

• A. Link MST directly to REF
• B. Link ACE to REF
• C. Sever the link between MST and REF and link one ACE environment directly to MST
• D. Disconnect MST from ACE

Answer: (C)

In upgrading, you want a controlled, auditable path for changes that keeps important baselines stable. Severing the link between the master environment (MST) and the reference baseline (REF) prevents upgrade changes from flowing into a baseline that should remain unchanged for accurate comparison. Then connecting one ACE environment directly to MST creates a clear, direct line for applying and validating the upgrade in a real test context, without contaminating the reference baseline. This setup makes it easier to observe the upgrade’s impact, rollback if needed, and verify results against a stable reference. The other options either allow changes to propagate into REF, route upgrades through a baseline that complicates validation, or remove the upgrade path to the test environment entirely, which defeats the goal of testing the upgrade in a realistic, isolated context.