An application receives HTTP 429 from Key Vault under load. What is the correct remedy?

1. A Increase the vault SKU
2. ✓ B Cache secrets in memory with a sensible refresh interval and apply exponential backoff (correct answer)
3. C Create more secrets
4. D Disable soft delete

Shortcut: Key Vault enforces per-vault transaction limits. Fetching a secret on every request is an anti-pattern; cache the value and retry with backoff on throttling.