A company is concerned about the security of its public web application due to recent web attacks. The application uses an Application Load Balancer (ALB). A solutions architect must reduce the risk of DDoS attacks against the application. What should the solutions architect do to meet this requirement?

1. Add an Amazon Inspector agent to the ALB.
2. Configure Amazon Macie to prevent attacks.
3. Enable AWS Shield Advanced to prevent attacks.
4. Configure Amazon GuardDuty to monitor the ALB.