You have an Azure Front Door instance (FD1) configured as shown. Before enabling Azure Private Link for FD1, what is the first action you must take?

Azure Private Link integration with Azure Front Door is a feature exclusively available in the Azure Front Door Premium tier. Therefore, before you can enable Private Link for your Front Door instance, you must upgrade its pricing tier from Standard or Classic to Premium. Adding an endpoint, creating a custom route, or creating an origin group are all configuration steps within Front Door, but they do not address the prerequisite of having the correct service tier to support Private Link. Without the Premium tier, the option to configure Private Link will not be available.