A solutions architect should recommend option A, which is to configure AWS WAF rules and associate them with the ALB. This will allow the company to apply traffic filtering at the application layer, which is necessary for protecting the ALB against common application-level attacks such as cross-site scripting or SQL injection. AWS WAF is a managed service that makes it easy to protect web applications from common web exploits that could affect application availability, compromise security, or consume excessive resources. The company can easily manage and update the rules to ensure the security of its application.