A Company Runs an E-Commerce Platform with Front-End and E-Commerce

A company runs an e-commerce platform with front-end and e-commerce tiers. Both tiers run on LAMP stacks with the front-end instances running behind a load balancing appliance that has a virtual offering on AWS. Currently, the Operations team uses SSH to log in to the instances to maintain patches and address other concerns. The platform has recently been the target of multiple attacks, including A DDoS attack. An SQL injection attack. Several successful dictionary attacks on SSH accounts on the web servers. The company wants to improve the security of the e-commerce platform by migrating to AWS. The company's Solutions Architects have decided to use the following approach: Code review the existing application and fix any SQL injection issues. Migrate the web application to AWS and leverage the latest AWS Linux AMI to address initial security patching. Install AWS Systems Manager to manage patching and allow the system administrators to run commands on all instances, as needed. What additional steps will address all of other identical attack types while providing high availability and minimizing risk?

A) Enable SSH access to the Amazon EC2 instances using a security group that limits access to specific IPs. Migrate on-premises MySQL to Amazon RDS Multi-AZ. Install the third-party load balancer from the AWS Marketplace and migrate the existing rules to the load balancer's AWS instances. Enable AWS Shield Standard for DDoS protection.
B) Disable SSH access to the Amazon EC2 instances. Migrate on-premises MySQL to Amazon RDS Multi-AZ. Leverage an Elastic Load Balancer to spread the load and enable AWS Shield Advanced for protection. Add an Amazon CloudFront distribution in front of the website. Enable AWS WAF on the distribution to manage the rules.
C) Enable SSH access to the Amazon EC2 instances through a bastion host secured by limiting access to specific IP addresses. Migrate on-premises MySQL to a self-managed EC2 instance. Leverage an AWS Elastic Load Balancer to spread the load and enable AWS Shield Standard for DDoS protection. Add an Amazon CloudFront distribution in front of the website.
D) Disable SSH access to the EC2 instances. Migrate on-premises MySQL to Amazon RDS Single-AZ. Leverage an AWS Elastic Load Balancer to spread the load. Add an Amazon CloudFront distribution in front of the website. Enable AWS WAF on the distribution to manage the rules.