You have a Web App on a D1 App Service plan. During peak traffic page load times increase. You want automatic scaling when CPU usage exceeds 80% and to keep costs low. What should you do first?

The D1 App Service plan is a Shared tier, which does not support autoscaling. To enable autoscaling, you must upgrade to a tier that supports it. The Standard tier is the lowest-cost tier that offers autoscaling capabilities, making it the most appropriate first step to meet the requirement of automatic scaling while keeping costs low. Enabling autoscaling on the current Web App is not possible because the D1 tier lacks this feature. Moving to the Premium tier would enable autoscaling but is a more expensive option than Standard, violating the "keep costs low" requirement. Switching to the Azure App Service consumption plan is for Azure Functions and is not applicable to a Web App in this scenario, nor does it directly address the autoscaling requirement for a Web App.