Explanation/Reference:
Explanation:
Example: With an Azure Storage container as a custom endpoint, IoT Hub will write messages to a blob based on the batch frequency and block size specified by the customer. After either the batch size or the batch frequency are hit, whichever happens first, IoT Hub will then write the enqueued messages to the storage container as a blob. You can also specify the naming convention you want to use for your blobs, as shown below.

Incorrect Answers:
A: Azure Stream Analytics data source outputs: A streaming job can have multiple outputs. Supported outputs are Azure Event Hubs, Azure Blob storage, Azure Table storage, Azure SQL DB, and Power BI.
References: https://azure.microsoft.com/en-us/blog/route-iot-device-messages-to-azure-storage-with- azure-iot-hub/