To minimize downtime during future DDoS events, the company should use services that provideactive DDoS protection and rapid mitigationat scale.AWS Shield Advanced(Option B) is designed for enhanced DDoS protection for internet-facing applications. It provides expanded detection and mitigation capabilities, cost protection in certain cases, and—critically—access to theAWS DDoS Response Team (DRT)through AWS Support so the company can engage experts during an attack to reduce impact and restore availability faster.

In addition,AWS WAF(Option E) helps mitigateapplication-layer (Layer 7)attacks that often accompany DDoS events (such as HTTP floods, bot-driven abuse, and known exploit patterns). WAF can block or challenge suspicious requests, apply rate-based controls, and use managed rule groups to reduce malicious traffic before it reaches the origin, improving resilience and availability.

Option A is incorrect because GuardDuty is a detection service; it does not automatically block traffic. Option C (Flow Logs + Lambda + SG blocks) is slow and brittle for DDoS because attackers are often distributed across many IPs and can change rapidly; security group updates are not an effective DDoS mitigation strategy. Option D is more about configuration governance and remediation, not real-time DDoS traffic mitigation.