A team needs to fan-out a single domain event to 20 different microservices. What is the most efficient Event Grid approach?
- A 20 separate custom topics, one per service
- B One custom topic with 20 event subscriptions (one per service) (correct answer)
- C Event Grid Domain with 20 domain topics
- D Service Bus topic with 20 subscriptions is better
Shortcut: A single custom topic with 20 event subscriptions is the correct approach. Event Grid delivers the event to each subscription independently. Domains are for multi-tenant scenarios with isolated topic namespaces.