A. Create a security group rule to deny all inbound traffic from the suspicious IP address. Associate the security group with the ALB.
B. Implement Amazon Detective to monitor traffic and to block malicious activity from the internet. Configure Detective to integrate with the ALB.
C. Implement AWS Resource Access Manager (AWS RAM) to manage traffic rules and to block malicious activity from the internet. Associate AWS RAM with the ALB.
D. Add the malicious IP address to an IP set in AWS WAF. Create a web ACL. Include an IP set rule with the action set to BLOCK. Associate the web ACL with the ALB.