What are two possible ways to achieve the goal?

You are developing a solution that will use Azure messaging services.

You need to ensure that the solution uses a publish-subscribe model and eliminates the need for constant polling.

What are two possible ways to achieve the goal? Each correct answer presents a complete solution. NOTE: Each correct selection is worth one point.
A . Service Bus
B . Event Hub
C . Event Grid
D . Queue

Answer: A,C

Explanation:

It is strongly recommended to use available messaging products and services that support a publish-subscribe model, rather than building your own. In Azure, consider using Service Bus or Event Grid. Other technologies that can be used for pub/sub messaging include Redis, RabbitMQ, and Apache Kafka.

Reference: https://docs.microsoft.com/en-us/azure/architecture/patterns/publisher-subscriber