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? 

Answer options:

A. Create a DNS record
B. Add a connection string
C. Upload a certificate.
D. Stop webapp1.

A

You can use either a CNAME record or an A record to map a custom DNS name to App Service. Reference: https://docs.microsoft.com/en-us/Azure/app-service/app-service-web-tutorial-custom-domain