Practice Exam

Explanations for each answer:

• Custom handler is incorrect. Custom handlers enable support for non-native languages by providing an HTTP bridge between the Functions host and your code. While you could manually implement blob access in a custom handler, this requires writing imperative code to connect to storage rather than using Azure Functions' declarative binding system.
• Extension bundle is incorrect. Extension bundles package binding extensions together for easy installation, making them available to your function app. While necessary for blob bindings to work, the bundle itself doesn't provide the declarative connection—it just makes the binding types available. You still need to declare the actual binding in your function.
• Trigger is correct. Triggers and bindings (including blob triggers and blob input/output bindings) provide declarative connections to Azure services. By adding binding attributes like [BlobTrigger] or [Blob] to function parameters, you declaratively specify the connection without writing imperative code to create clients, authenticate, or manage connections. The Functions runtime handles all the plumbing automatically.
• Runtime is incorrect. The runtime provides the execution environment for your chosen language (.NET, Node.js, Python, etc.) but doesn't specifically provide declarative connections to Azure services. While the runtime enables your code to execute, the declarative connection capability comes from the triggers and bindings system, not the runtime itself.
• Policy is incorrect. Policies in Azure Functions relate to configuration, security, and governance settings. They don't provide mechanisms for connecting to Azure Storage or other services. Policies control behavior and access, not service connectivity.
• Hosting plan is incorrect. Hosting plans determine where and how your functions run (Consumption, Premium, Dedicated) but don't affect how functions connect to services. The declarative binding system works the same way regardless of which hosting plan you choose.