B. Web application firewall (WAF)
Explanation:
A Web Application Firewall (WAF) monitors, filters, and blocks HTTP traffic to and from a web application. It is specifically designed to detect and prevent attacks like SQL injections by inspecting and filtering malicious inputs before they reach the application.
Why the other answers are incorrect:
A. Reverse proxy: Primarily used for load balancing and masking internal IPs, not specifically for SQL injection prevention.
C. Stateful firewall: Monitors network traffic and connections but doesn't inspect application-level traffic like SQL queries.
D. Web content filtering: Blocks access to inappropriate websites but doesn't protect against SQL injection within web applications.
The answer is B, web application firewall (WAF).
A WAF is a security appliance that monitors and filters web traffic. It can be used to block malicious traffic, including SQL injection attacks.
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