The correct answer is Swap-AzWebAppSlot -ResourceGroupName "rgAppServices" -Name "webPortal" -SourceSlotName "preprod" -DestinationSlotName "live".

The Swap-AzWebAppSlot cmdlet is the Azure PowerShell command designed specifically to swap deployment slots for an App Service. It uses the ResourceGroupName and Name parameters to locate the app and the SourceSlotName and DestinationSlotName parameters to specify which slots to exchange, so the shown command will exchange the preprod slot with the live slot.

The Swap-AzWebAppSlot operation swaps the content and most configuration settings between the two slots in a controlled way, which is the intended behavior for promoting a preproduction slot to live without manual file moves.

Move-AzWebAppSlot -ResourceGroupName "rgAppServices" -Name "webPortal" -FromSlot "preprod" -ToSlot "live" is incorrect because there is no standard Azure PowerShell cmdlet named Move-AzWebAppSlot for performing slot swaps and the parameter names do not match the documented swap cmdlet.

Set-AzWebAppSlot -ResourceGroupName "rgAppServices" -Name "webPortal" -SourceSlot "preprod" -DestinationSlot "live" is incorrect because Set-AzWebAppSlot is used to configure or update slot settings rather than to perform a swap operation and the parameter names shown are not the ones used for swapping.

Switch-AzWebAppSlot -ResourceGroupName "rgAppServices" -AppName "webPortal" -Source "preprod" -Target "live" is incorrect because Switch-AzWebAppSlot is not a valid Azure PowerShell cmdlet and the parameter names do not follow Azure PowerShell conventions for slot operations.

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