Final answer:
Leah should consider a policy-based firewall as it offers the ability to create more generic policy statements, allowing for flexibility without the need for specific rules.
Step-by-step explanation:
If Leah is looking for a firewall that allows for more generic statements instead of creating specific rules, she should consider purchasing a policy-based firewall. A policy-based firewall allows administrators to create granular policies based on users, applications, and other factors, which can be more flexible and easier to manage than traditional rule-based firewalls.
Unlike content/URL filtering firewalls, proprietary firewalls, or hardware firewalls which may require more specific rules and configurations, a policy-based firewall operates on a higher level of abstraction, allowing for policies that translate into many underlying rules.
This would support Leah's need for a system that doesn't require her to define numerous detailed rules.