az webapp log tail is correct because it is the Azure CLI command that streams an App Service application log file in real time.

The command opens a live stream to the App Service and displays application and web server logs as they are generated so you can observe requests and errors immediately. You invoke it against the target web app and resource group and the stream continues until you stop it.

az webapp download is incorrect because that command is for retrieving app content or deployment artifacts and it does not open a live log stream.

Get-AzAppServiceLog is incorrect because it represents a PowerShell style cmdlet rather than the Azure CLI command that provides the live tail feature, and the exam asked for an Azure CLI command.

az webapp log -all is incorrect because that is not the proper syntax for streaming logs and it does not correspond to the live tail operation which uses the explicit az webapp log tail command.

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