Which of the following services can be used to mitigate DDos attacks to your application hosted in AWS. Choose 3 answers from the options given below

Answer options:

A.Route53
B.Cloudfront
C.Elastic Load balancer
D.SQS

Answer-A,B & C
The AWS documentation mentions the following
1. Route53- One of the most common targets of DDoS attacks is the Domain Name System (DNS). Amazon Route 53 is a highly available and scalable DNS service designed to route end users to infrastructure running inside or outside of AWS. Route 53 makes it possible to manage traffic globally through a variety of routing types, and provides out-of-the-box shuffle sharding and Anycast routing capabilities to protect domain names from DNS-based DDoS attacks.
2. Cloudfront - Amazon CloudFront distributes traffic across multiple Points of Presence (PoP) locations and filters requests to ensure that only valid HTTP(S) requests will be forwarded to backend hosts.
3. Elastic Load Balancing (ELB) enables the automatic distribution of application traffic to several Amazon Elastic Compute Cloud (Amazon EC2) instances across multiple Availability Zones, which minimizes the risk of overloading a single EC2 instance. Elastic Load Balancing, like CloudFront, only supports valid TCP requests, so DDoS attacks such as UDP and SYN floods are not able to reach EC2 instances
For more information on mitigation of DDos attacks, please refer to the below link:
https://aws.amazon.com/answers/networking/aws-ddos-attack-mitigation/