A microservice communicates with others via Redis Pub/Sub. What is a key limitation of Redis Pub/Sub compared to Streams?
- A Pub/Sub doesn't support multiple subscribers
- B Messages are ephemeral — offline subscribers miss published messages (correct answer)
- C Pub/Sub requires authentication
- D Pub/Sub only supports string messages
Shortcut: Redis Pub/Sub is fire-and-forget. Messages published while a subscriber is offline are lost. Use Redis Streams for persistent, consumer-group-based reliable messaging.