Final answer:
The information security manager's best recommendation would be to deploy a UTM (Unified Threat Management) solution.
Step-by-step explanation:
The best recommendation the information security manager could make in this scenario is to deploy a UTM solution.
A UTM (Unified Threat Management) solution is a comprehensive security system that combines multiple security features, such as firewall, intrusion prevention system (IPS), antivirus, web filtering, and more, into a single device or software. It provides all the necessary tools to block suspicious websites, prevent attacks based on threat intelligence, reduce spam, protect applications from web-based threats, and prevent viruses based on signature. By implementing a UTM solution, the organization can enhance its security stance and meet the COO's criteria.