Jacob works as a system administrator in an organization. He wants to extract the source code of a mobile application and disassemble the application to analyze its design flaws. Using this technique,

Reverse engineering is the process of analyzing a system to understand its components, design, and functionality, often by disassembling compiled code to reconstruct its source, precisely matching Jacob's goal of understanding and fixing application flaws.

App sandboxing is a security mechanism to isolate applications, not a technique for analyzing their internal code for flaws.

Jailbreaking or rooting removes manufacturer restrictions from a device's operating system, rather than analyzing a specific application's source code.

Social engineering exploits human psychology to gain information or access, completely unrelated to technical code analysis.