You have deployed a website that utilizes CloudFront, Elastic Loadbalancer, and S3 to serve content. When users access your site, they receive a "mixed content" security warning.
What is most likely the problem?

A. There is no rule in your bucket policy allowing public access.
B. You have applied your SSL to your Elastic Loadbalancer but not your CDN.
C. Your S3 Bucket permissions are incorrect.
D. You are using an SSL from an external CA.