What should you do first?

You have an Azure subscription that contains a web app named webapp1. You need to add a custom domain named www.contoso.com to webapp1.

What should you do first?
A . Upload a certificate.
B . Add a connection string.
C . Stop webapp1.
D . Create a DNS record.

Answer: D

Explanation:

You can use either a CNAME record or an A record to map a custom DNS name to App Service. You should use CNAME records for all custom DNS names except root domains (for example, contoso.com). For root domains, use A records.

Reference: https://docs.microsoft.com/en-us/Azure/app-service/app-service-web-tutorial-custom-domain