Final answer:
Paul chose the Risk Mitigation strategy to manage the risk of hackers connecting to open ports on servers by implementing a network firewall.
Step-by-step explanation:
Paul chose the Risk Mitigation strategy to manage the risk of hackers connecting to open ports on servers. Risk Mitigation involves taking actions to reduce the impact or likelihood of a risk. By implementing a network firewall, Paul has taken proactive measures to decrease the likelihood of a successful attack on his network. The firewall acts as a barrier between the internal network and external threats, preventing unauthorized access through open ports.