The correct option is Azure Storage Explorer.

Azure Storage Explorer provides a simple graphical interface that lets you connect to a storage account and upload or download blobs directly from your on premise machine. It supports drag and drop and bulk transfers, so it is the fastest and lowest overhead way to move a few blueprint package files into Azure Blob Storage without ordering hardware or reconfiguring network file shares.

Order an Azure Data Box to ship data to Azure is incorrect because Azure Data Box is intended for very large datasets and it requires ordering, shipping, and ingest procedures that are unnecessary for moving just a few files.

Generate a storage account access key and map a network drive to copy the files with File Explorer is incorrect because mapping a network drive with File Explorer applies to Azure File Shares over SMB and not to Blob storage. Copying directly to blob containers from File Explorer is not supported without additional tooling, so this approach will not work for blob uploads.

Use the Azure Import Export service is incorrect because the Import Export service is an older, disk shipment based method for bulk import and it has been largely superseded by Azure Data Box for large scale imports. It is not the practical choice for transferring a small set of files.

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