What is the difference between VM transient queues and persistent queues?

• A. Persistent queues are slower, but transient queues are lost in the case of an app crash.
• B. Transient queues are slower, but persistent queues are lost if the app crashes.
• C. Both types have identical durability.
• D. Transient queues are never lost; persistent queues crash on outage.

Answer: (A)

VM queues differ in durability and speed. Transient queues live in memory, so they are fast but not durable — if the app crashes or the VM restarts, the messages in a transient queue are lost. Persistent queues are stored durably (on disk or another persistent store), so the messages survive crashes and restarts, but that durability comes with slower performance due to the disk I/O involved. This is exactly what the option describes: persistent queues are slower, while transient queues are lost if the app crashes. The other statements mix up durability and continuity, claiming identical durability or that persistent queues survive outages in a way that isn’t accurate.