Which Event Grid delivery mode, introduced in the Namespace topics tier, allows clients to pull events at their own pace without a push endpoint?

1. A Webhook delivery only
2. ✓ B Pull delivery (client polls endpoint for events) (correct answer)
3. C Queue-based delivery
4. D SSE (Server-Sent Events)

Shortcut: Event Grid Namespace topics support pull delivery where clients poll for events using the ReceiveEvents API. This removes the need for a publicly accessible webhook endpoint.