C). Autoscaling: This is important to ensure high availability and resiliency of the web-based application. By using autoscaling, additional resources can be automatically allocated to handle spikes in traffic or when the application is running at or near capacity. D). WAF: This is important for protecting the application against DoS and DDoS attacks. A Web Application Firewall (WAF) can help detect and block malicious traffic and attacks on the application. E). CDN: This is important for improving the performance and availability of the application. By using a Content Delivery Network (CDN), content can be delivered from a distributed network of servers, reducing latency and improving the user experience.