A Start-up company is launching a new web application using AWS Cloud infrastructure. This is a three-tier application behind load balancers with content stored in Amazon S3 buckets within a region & CloudFront to cache data. The company plans to use its own domain name. Web content should be delivered at the lowest latency to global users. Which of the following is a cost-efficient solution while creating name records with Route 53?

Answer options:

A.Create a CNAME record for web application pointing to Amazon S3 bucket with the same name.
B.Create an Alias record for web application pointing to CloudFront distribution.
C.Create an Alias record for web application pointing to Amazon S3 bucket with the same name.
D.Create a CNAME record for web application pointing to CloudFront distribution.

Correct Answer: B
An Alias record can be created to redirect traffic to specific AWS resources. The company can create an alias record for its domain name pointing to CloudFront Distribution. When a user accesses a web application from any region, it would be redirected to the nearest CloudFront edge location and fetch web content with the lowest latency.
Option A & D are incorrect as creating a CNAME record with Route 53 involves charges.
Option C is incorrect as although this will work. But requirement of the lowest latency for global users will not meet with storing web content in the S3 bucket.
For more information on the difference between Alias & CNAME records, refer to the following URLs-
https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/resource-record-sets-choosing-alias-non-alias.html