A technician receives a device with the following anomalies: Frequent pop-up ads Show response-time switching between active programs Unresponsive peripherals The technician reviews the following log

A web application firewall (WAF) primarily protects web servers from attacks targeting web applications, which is unrelated to the client-side operating system issues and file tampering evidenced by the MD5 mismatch.

The log entry for `iexplore.exe` shows a discrepancy between the source MD5 and the target MD5, indicating that the file on the system has been modified or tampered with. A file integrity check is specifically designed to detect such unauthorized changes to files by comparing their current hash values against known good baseline values.

Data Execution Prevention (DEP) is a security feature that prevents malicious code from running in non-executable memory regions; the logs, however, do not indicate a DEP issue but rather a file modification.

Removable media control manages access and usage of devices like USB drives. While unresponsive peripherals are noted, the most direct and critical evidence from the logs is the file modification, not a specific failure of removable media control.