The issue is tracing the original source of requests in a tiered architecture with a load balancer. The web server logs show internal IPs (192.168.1.10), not the external client IPs, because the load balancer forwards requests without preserving the source. Enabling theX-Forwarded-Forheader on the load balancer adds the client's original IP to the HTTP request headers, allowing downstream servers to log it. This ensures traceability without altering the architecture significantly.
Option A:Correct-X-Forwarded-For is the standard solution for preserving client IPs through load balancers.
Option B:A Host-based Intrusion Detection System (HIDS) detects anomalies but doesn't address IP traceability.
Option C:A trusted CA certificate fixes the self-signed warning but is unrelated to source tracking.
Option D:Stored procedures improve database security but don't help with IP logging.
Option E:Storing $_SERVER['REMOTE_ADDR'] captures the loadbalancer's IP, not the client's, unless X-Forwarded-For is enabled.