Which Event Grid feature reduces cost when a handler only cares about 1% of a high-volume event stream?

1. A Increasing retry limits
2. ✓ B Server-side filtering on the subscription (correct answer)
3. C Batching
4. D Dead-lettering

Shortcut: Filters are applied before delivery, so unmatched events are never sent and never billed as deliveries or handler invocations.