The correct answer is Provision a single App Service Plan to host all eight web app instances.

You should provision a single App Service Plan in West Europe because an App Service Plan defines the compute resources and pricing and it can host multiple web apps. Using one App Service Plan lets you scale the compute at the plan level and minimizes cost compared with creating separate plans for each app.

Deploy Azure Front Door is incorrect because Azure Front Door is a global application delivery and load balancing service and it is not required to provide the App Service compute resources for the web apps. It is an optional networking component and it would add cost rather than satisfy the deployment prerequisite.

Create separate App Service Plans for each web app instance is incorrect because provisioning eight separate plans increases compute and licensing costs and is unnecessary when a single App Service Plan can host multiple web apps and handle scale.

Set up an Application Gateway is incorrect because Application Gateway is a regional traffic manager and web application firewall and it is not a prerequisite for deploying App Service instances. It is a networking option that adds features and cost but does not replace the need for an App Service Plan.

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