Which statement about Redis clustering is accurate for multi-key operations?

1. A Any keys can be used in one transaction
2. ✓ B Multi-key operations require the keys to hash to the same slot, achieved with hash tags {} (correct answer)
3. C Clustering removes all multi-key limits
4. D Transactions are unsupported in clustered mode

Shortcut: In cluster mode, keys must reside in the same hash slot for multi-key commands. Wrapping a common substring in braces, such as user:{123}:profile, forces co-location.