A business is transferring a classic storefront online application to the Amazon Web Services (AWS) Cloud. The program i

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A business is transferring a classic storefront online application to the Amazon Web Services (AWS) Cloud. The program is sophisticated and refactoring will take many months. Until the replacement web application is completed and deployed, a solutions architect proposed utilizing Amazon CloudFront with a custom origin connecting to the SSL endpoint URL for the old web application.
For many weeks, the intermediate solution worked. However, all browser connections have lately begun to display an HTTP 502 Bad Gateway error with the header 'X-Cache: Error from cloudfront.' Monitoring services indicate that the traditional web application's HTTPS port 443 is accessible and accepting requests.

What is the most probable source of the mistake, and how do you fix it?

A. The origin access identity is not correct. Edit the CloudFront distribution and update the identity in the origins settings.
B. The SSL certificate on the CloudFront distribution has expired. Use AWS Certificate Manager (ACM) in the us-east-1 Region to replace the SSL certificate in the CloudFront distribution with a new certificate.
C. The SSL certificate on the legacy web application server has expired. Use AWS Certificate Manager (ACM) in the us-east-1 Region to create a new SSL certificate. Export the public and private keys, and install the certificate on the legacy web application.
D. The SSL certificate on the legacy web application server has expired. Replace the SSL certificate on the web server with one signed by a globally recognized certificate authority (CA). Install the full certificate chain onto the legacy web application server.