What should you create in Azure to support the creation of the backups for DB1?

An Azure Content Delivery Network (CDN) endpoint is used for caching and delivering web content globally and is not designed as a primary storage solution for database backups.

A Service Bus namespace is an enterprise messaging service used for reliable message queuing and publish/subscribe scenarios, not for storing large volumes of backup data.

Azure storage accounts are foundational services that provide highly available, durable, scalable, and secure storage for various data objects, including blobs which are ideal for storing database backups. Database backups are commonly stored as files or VHDs within blob containers, making a storage account the essential underlying service for backup retention.

A cloud service (classic) provides a platform for hosting highly available web applications and services, but it is a compute service and not a dedicated storage service for backups.