Explanation: CloudFront is a web service that speeds up distribution of your static and dynamic web content, forexample, .html, .css, .php, and image files, to end users. Every CloudFront web distribution must beassociated either with the default CloudFront certificate or with a custom SSL certificate. Before you can delete an SSL certificate, you need to either rotate SSL certificates (replace thecurrent custom SSL certificate with another custom SSL certificate) or revert from using a custom SSLcertificate to using the default CloudFront certificate. Reference:http://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/Troubleshooting.html