A security tester is reverse engineering a desktop application. Which of the following specialized tools would be best to use?

Ettercap is a network-based tool primarily used for man-in-the-middle attacks and sniffing network traffic, not for reverse engineering desktop applications.

Responder is a tool designed to answer NetBIOS name service and LLMNR queries, used for capturing credentials on a network, which is unrelated to reverse engineering desktop applications.

Burp Suite is a web application security testing platform that primarily intercepts and manipulates HTTP/HTTPS traffic, making it unsuitable for direct desktop application reverse engineering.

Frida is a dynamic instrumentation toolkit that allows security testers to inject custom JavaScript or Python scripts into running processes on various platforms, enabling real-time inspection, modification, and understanding of a desktop application's behavior during reverse engineering.