An interactive, dynamic website runs on Amazon EC2 instances in a single subnet behind an ELB Classic Load Balancer. Which design changes will make the site more highly available?
A. Move some Amazon EC2 instances to a subnet in a different way.
B. Move the website to Amazon S3.
C. Change the ELB to an Application Load Balancer.
D. Move some Amazon EC2 instances to a subnet in the same Availability Zone.