Which of the below are viable mitigation techniques?

You are designing a social media site and are considering how to mitigate distributed denial-of-service (DDoS) attacks.

Which of the below are viable mitigation techniques? (Choose three.)
A . Add multiple elastic network interfaces (ENIs) to each EC2 instance to increase the network bandwidth.
B . Use dedicated instances to ensure that each instance has the maximum performance possible.
C . Use an Amazon CloudFront distribution for both static and dynamic content.
D . Use an Elastic Load Balancer with auto scaling groups at the web, app and Amazon Relational Database Service (RDS) tiers
E . Add alert Amazon CloudWatch to look for high Network in and CPU utilization.
F . Create processes and capabilities to quickly add and remove rules to the instance OS firewall.

Answer: CDE