A Company Runs a Web Application That Users Access Using

A company runs a web application that users access using the domain name www.example.com. The company manages the domain name using Amazon Route 53. The company created an Amazon CloudFront distribution in front of the application and would like www.example.com to access the application though CloudFront. What is the MOST cost-effective way to achieve this?

A) Create CNAME record in Amazon Route 53 that points to the CloudFront distribution URL.
B) Create an ALIAS record in Amazon Route 53 that points to the CloudFront distribution URL.
C) Create an A record in Amazon Route 53 that points to the public IP address of the web application.
D) Create a PTR record in Amazon Route 53 that points to the public IP address of the web application.