What is the MOST likely cause and how can the DevOps Engineer mitigate this problem for this and future versions of the website?

A company has developed a static website hosted on an Amazon S3 bucket. The website is deployed using AWS CloudFormation. The CloudFormation template defines an S3 bucket and a custom resource that copies content into the bucket from a source location. The company has decided that it needs to move the website to a new location, so the existing CloudFormation stack must be deleted and re-created.

However, CloudFormation reports that the stack could not be deleted cleanly.

What is the MOST likely cause and how can the DevOps Engineer mitigate this problem for this and future versions of the website?
A . Deletion has failed because the S3 bucket has an active website configuration. Modify the CloudFormation template to remove the WebsiteConfigurationproperty from the S3 bucket resource.
B . Deletion has failed because the S3 bucket is not empty. Modify the custom resource’s AWS Lambda function code to recursively empty the bucket when RequestTypeis Delete.
C . Deletion has failed because the custom resource does not define a deletion policy. Add a DeletionPolicyproperty to the custom resource definition with a value of RemoveOnDeletion.
D . Deletion has failed because the S3 bucket is not empty. Modify the S3 bucket resource in the CloudFormation template to add a DeletionPolicyproperty with a value of Empty.

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Answer: B