The correct options are Set-AzAks PowerShell cmdlet and az aks command.

Both the Set-AzAks PowerShell cmdlet and the az aks command operate in the Azure management plane and allow you to enable and configure the AKS cluster autoscaler by updating the managed cluster or node pool settings. These tools provide parameters to turn on the autoscaler and to set the minimum and maximum node counts so you can control scaling behavior.

For example the az aks command exposes parameters such as --enable-cluster-autoscaler and parameters for minimum and maximum counts when updating a node pool or cluster and the PowerShell cmdlet provides equivalent options for scripting and automation.

The option kubectl command is incorrect because kubectl manages Kubernetes resources inside the cluster and it does not change Azure managed node pool autoscaling settings that are controlled through the Azure management plane.

The option Azure Resource Manager template is incorrect because templates declare and deploy Azure resources but enabling the AKS cluster autoscaler is typically performed by updating the managed cluster or node pool properties with CLI or PowerShell rather than by a template alone.

The option Azure portal is incorrect because the portal does not always expose the full set of autoscaler configuration options and the recommended and precise method for enabling and tuning the autoscaler is to use the CLI or PowerShell.

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