Troubleshooting Tips for AWS

Answer - C.

This is given as use case scenarios in the AWS Documentation.

Cross-Origin Resource Sharing: Use-case Scenarios.

The following are example scenarios for using CORS.

Scenario 1: Suppose you are hosting a website in an Amazon S3 bucket named website described in Hosting a Static Website on Amazon S3

Your users load the website endpoint http://website.s3-website-us-east-1.amazonaws.com.

Now you want to use JavaScript on the webpages stored in this bucket to make authenticated GET and PUT requests against the same bucket by using the Amazon S3 API endpoint for the bucket website.s3.amazonaws.com.

A browser would normally block JavaScript from allowing those requests, but with CORS, you can configure your bucket to enable cross-origin requests from website.s3-website-us-east-1.amazonaws.com explicitly.

Scenario 2: Suppose that you want to host a web font from your S3 bucket.

Again, browsers require a CORS check (also called a preflight check) for loading web fonts.

You would configure the bucket that hosts the web font to allow any origin to make these requests.

Option A is incorrect because Enabling versioning does not solve the problems of accessing form the different buckets.

You need to enable CORS on the underlying bucket.

Option B is incorrect because Enabling replication will cost you more as you are maintaining two copies of data.

Option D is incorrect because changing the bucket policy allows access from another bucket, but this will open the whole bucket, not an ideal solution.

For more information on Cross-Origin Resource Sharing, please refer to the below link-

https://docs.aws.amazon.com/AmazonS3/latest/dev/cors.html

The error that is being observed suggests that the web page's JavaScript code is trying to access data hosted in another S3 bucket but is unable to do so. There could be several reasons for this error, but the most common reason is a Cross-Origin Resource Sharing (CORS) issue.

CORS is a security feature implemented by web browsers that restricts web pages from accessing resources located on a different domain than the one the web page is hosted on. This security feature is designed to prevent malicious scripts from accessing data from other websites without permission.

In this scenario, the web page is trying to access data hosted in another S3 bucket. However, if the CORS configuration on that S3 bucket is not set up correctly, the web page's JavaScript code will not be able to access the data, resulting in an error.

Therefore, the correct answer to this question is option C - Enable CORS on the bucket containing the data.

Enabling CORS allows the web page's JavaScript code to access data from other domains, including the S3 bucket where the data is hosted. This can be achieved by configuring the CORS rules on the S3 bucket hosting the data to allow access from the domain where the web page is hosted.

Options A, B, and D are incorrect because they do not address the root cause of the error, which is the CORS issue. Enabling versioning or replication or changing the bucket policy may be required for other reasons, but they will not help alleviate the error in this scenario.