Final answer:
Kevin should implement a WAF (Web Application Firewall) to protect against attacks such as SQL injection and cross-site scripting, as it operates at the application layer and is designed to filter out malicious web traffic.
Step-by-step explanation:
The technology that Kevin should choose to protect against SQL injection, cross-site scripting, and similar attacks is B. WAF (Web Application Firewall). A WAF is specifically designed to monitor, filter, and block malicious traffic to and from web applications. Unlike traditional firewalls such as packet filters and stateful inspections that primarily focus on protecting network traffic, WAFs analyze the data being transmitted to the web applications and apply rules to help protect against vulnerabilities such as SQL injection and cross-site scripting (XSS). WAFs typically operate at Layer 7 (Application Layer) of the OSI model, which allows them to inspect the contents of the traffic and stop attacks that might exploit weaknesses in web application logic.